A few further comments
1) The rising sign, the first house, and the Ascendant (degree) are all quite different in my view and should not be lumped together.
That's a very interesting comment and I think it's well worth considering that distinction in analysis. Originally there was no distinction between first house and rising sign, as whole sign housese were used. However the gradual dominance of quadrant house systems does raise the issue of how first house and rising sign differ, if at all. Like Dave, I use a quadrant house system, so Dave's point is very relevant to me. Thinking about Dave's point I realised that I do distinguish between the rising sign and the first House and I'll explain how below, as the method is relevant to some of Dave's other points (from my approach - I'm not suggesting Dave uses it LOL)
I believe that personality is more than a rising sign, but includes all planets within that sign and the first house and planets in aspect patterns to planets in this area of the chart. It is also more, including the Sun, Moon and other factors. I think of personality as a specific mask that gives a first appearance, but which is also the mind and feelings and habit patterns underneath that mask.
Yes personality (temperament in my approach) is dependent on more than the first house, and yes, Sun and Moon and other factors are relevant - again I'll say a little bit more, as I only gave a potted view above. The point here though is that there's a difference between our life and body (the first) and our mind and personality.
Interetingly as an aside, Lilly, when looking for a significator of manners (what we would call outward behaviour) looks first at planets in the 'sign ascending' rather than the first house as such.
2) The SUN is well described in many astrological cook books --- and its all wrong in my opinion, or much of it is wrong. Jeff Mayo (Faculty of Astrological Studies in London, and my former teacher) said it best when he noted that thi Sun is the point of "Integration." It took awhile for that to make sense for me. Many of the Sun's keywords more properly belong to Jupiter (which may be the most complex of all the planets to understand). The Sun vitalizes and powers the planets it touches. It equally shine light on the chart angles. By itself, it has less direct "keyword" meanings but rather adds and powers whatever planet or angle it affects. SUN does have meaning the work for medical, health and mundane events, but as a personal planet-like expression it is not so big on specifics.
This point of Dave's had me scrabbling for my copy of Lilly's Book III as it remiinded me of something he said
'The luminaries in the Horoscope effect no great matters, but in a general way, unless they be wonderful stongly fortified'
Now this is not quite what Dave said, as when Lilly refers to the
'Horoscope' he means the first House, not the entire chart. However his sentiments about the luminaries are that there effect is general rather than specific - general across the board effect
In terms of keywords, the SUN (in my opinion) expresses itself in terms of SIGN and HOUSE meanings. By Sign expression, I'm seeing the "sign" as being much like Vedic/Joytish signs are construed; Aries is hot, brash and active. (Fire, Action) Period. Taurus is aquisitive, self absorbed and comfort seeking. (Sensual, status quo) Period. So, we get to use these short approaches to how the Sun expresses itself along with relationships to the other planets and the angles.
I take a slightly different view - I agree with Dave's comment about 'sign' taking the elements as Fire (Hot and Dry) = Choleric; Earth (Cold and Dry) = Melancholic; Ait (Hot and Moist) = Sanguine and Water (Cold and Wet) = Phlegmatic.
Although Dave doesn't use these terms, he's reduced the essentials of the Sign to Elements (and also the Modes, Cardinal, Fixed and Mutable) and it's the elements alone that I use in assessing temperament. I differ from Dave in that I don't apply the elements to the Sun in the same way that he does - I use the approach of assigning temperament to Season (The Sun in relation to Earth effectively defines these) So I for assessing the Sun, I'd actually treat Sun in Aries as being Sanguine - as Aries is a Spring sign and the Spring is Hot and Moist. While this is a bit different from Dave, we are both actually taking the Signs as Sun defined (The Zodiac being a band around the ecliptic) Dave takes Sun by Sign on a Sign by Sign basis, I take it on its phase relation to the Earth. Now whlist that is standard for a traditional approach it is very different from the moder cookbook approaches, so I think you need to think long and hard before you begin to toy with changing from the modern approach, as a beginner.
Now, here I should mention that SIGNS may not have any real meaning for the rest of the planets in the chart. The planets (other than Sun, Moon) don't need signs but do react to aspects, phases, and house expressions, etc. This is contrary to what most books say. In the modern sense (relative to traditional, medeival or hellenistic or ancient practices) planets in aspect to each other, in a cyclic or phase relationship scheme, or in midpoint and harmonic structures are highly meaningful. I only need to note that it is easy to read a chart and a person in terms of only the planets and without recourse to sign meanings. In fact, that is the way I practice astrology. No signs beyond Sun and Moon signs in the natal chart, no houses other than in the natal chart. I have stripped away 95% of what i ever read in books and have kept only the few things that always work.
Now here I differ quite a lot from Dave, and from the cook books of modern Astrology. I'll start with what I agree with above - planets in aspect, and planets in cyclic or phase relation. Oddly though Dave and I use quite different phase relationships. Apart from the Moon, I've not seen Dave make much use (or indeed any use that I can recall) of planets in phase relation to the Sun but I take that phase relation as very important. It governs and accounts for retrograde motion, it distinguishes between occidental and oriental positions, the 'speed' of the planet and it places great emphasis on whether a planet is visible or is obscured by the Sun. These phase relations have fallen out of use by modern Astrologers, who seem to see more importance in phase relations between the planets from Mercury out. But I must admit that I can see no reason for insisting that those phase relationships are important but that the phase relations with the Sun are not (apart from Sun/Moon).
Now let me turn to Signs - I don't use signs in the modern sense. But I do see sign placement as important. It's not just the Sun that moves through the Zodiac - the other planets do (apart from Pluto, which can be outside it) They may not always be on the ecliptic (and often are not) but a planet is in a sign and it's in a sign because the gravitational pull of the Sun has put the planets in a plane around the Sun. There's never been a time when the planets have not been placed or given meaning separate from the Zodiac. Yes you can read a chart without using signs for planets, but in so doing you cut yourself off from a significant core element of (All) Astrology. I agree with Dave's rejection of cook book sign meanings, but to be honest, if you reject signs for planets, what really is to stop you rejecting Signs for the Moon (which is not the only planet to have phase relationship with the Sun) and even the Sun itself by treating the Zodiac as simply a measuring scale. After all it's the phase relation of Sun to Earth that makes a difference, not the measuring scale - or is it?
Do I reccommend this approach for most beginners? No. I recommend buying, reading at least 100 books covering many aspects of astrology, and of constructing and deeply reading a few hundred charts to start with. Astrology is a all-or-nothing pursuit. Anything less and you end up following astrology in books, magazines, the Internet, but you never end up really practicing it or understanding it. I've been at it for almost 40 years, non-professionally, and I still have weeks when I construct 30 or 50 charts. You have to get involved. Obsessed? No. I live for astrology but I don't live by it. I seldom look at my own chart. I can't exercise the perspective needed to deal with my own chart.
I don't recommend my approach to beginners either, unless they are specifically interested, though I think it's very important that they realise that the cook books and the vast majority of modern texts are not the only way that Astrology can be practised. Read a lot - though 100 books is perhaps Virgo overkill (modern sense) unless of course you get the bug. Do lots of charts but think about them, store them away and as you learn more go back and look at them and rethink your interpretation.
Take a lot of note of Dave's comment about the big picture. There's far more to Astrology than the natal chart. Look at some of the other branches. Try Horary and Event Astrology because you will find the former easier if you are a Tarot reader (you have the basic understanding of answering questions) and Horary only uses part of a chart, so you begin to learn pictures at a simple level.
Like Dave I don't do my own chart - I've seen some professionals who get obsessed with it and let it rule their lives - Dave's advice above is so important that we should all keep it in mind and keep that obsession at bay.
To end I'll briefly list the factors that I'd take into account in assessing personality (temperament) - Note where 'sign' is mentioned it is by element, as above
Ascending Sign
Ruler of the Ascending Sign by nature
Ruler of the Ascending Sign by Sign placement
Planets in the first, if any
Planets aspecting the Ascendant by Sign
Moon Sign
Moon Ruler
Moon Phase
Planets aspecting the Moon by Sign
Sun by Season of the Year
Lord of the Geniture
Sign of the Lord of the Geniture
Now this fits in reasonably with Dave's comments above, though as I've said by no means exactly. Nevertheless we're both looking at Ascendant, Rising Sign, First House, Planets in the First, Planets aspecting the Ascendant,Moon by sign, Sun by sign (with the proviso I made above). In my case the rising Sign also has an effect by element, as it does for Dave, and I also take into account its ruler. we probably differ is in my use of rulers, especially for the Moon and the signs of those rulers (even though I'm not using 'sign' in a modern sense). I've also use a 'quick' system which leaves out the aspects and planets in the first but does include the Almuten of the Ascendant, which is determined by the degree of the Ascendant and may well be differ from elsewhere in the sign.
As a beginner, you should be aware of and take some note of the agreements between Dave and me, simply because they represent a reasonably good common ground. Whether you include any of the differences is up to you and if you're like me, this will change as you learn more. I once operated a scheme based on Tracy Marks - I gradually refined it and dropped the bits I didn't like. When I took up a traditional approach I based my method on a simplified Lilly - I'm now using a mixture of Lilly and the simplified approach of Dorian Greenbaum and as I do more charts and more thinking, I'll be dropping the bits that don't work so well and adding in new bits.