Actually I have two questions I am interested in, both closely connected. But maybe answering the first would be better off in another part of the forum... nevertheless:
How do you know about your spirit guides in the first place? Their presence, character and appearance? And then, how does the contact via Tarot work? How do you establish it and when you have done the reading, how do you know it is from the respective spirit? Is it simply a matter of believing?
I can answer the 1st bit of your question by sharing my own experience. The rest I cannot comment on - as I've never conversed with my guides using a Tarot deck (and only just got the idea from joining this forum
I'll get around to trying it when it fits...). In-fact the rest of your question could be my own - so I shall be watching this thread closely.
So - here goes:
Spirit guides first "appeared" to me (or I decided to have some - I'm never quite sure which) when I began exploring/learning forms of "alternative" therapy, or esoteric practice.
In every case - I was not deliberately looking to find one. It just seemed that I repeatedly began "seeing" them like a sort of vision, or "idea" that followed me around - and after a while I figured they must be what everyone described as guides.
It is possible to deliberately sit through a guided meditation to "find your spirit guide" - and indeed, in Shamanic practice (neo-practice I think - I know very little) I believe one goes on a guided pathworking to a specific plane, to find one's personal spirit guide/s.
My 1st two "appeared" to me, during my Reiki 1 attunement many years ago.
Whilst lying there with my eyes closed having the attunement - I saw and heard a number of things. I saw a guide in the form of an Arctic fox sitting at my feet, and one as a man at my side - sort-of Mongolian looking.
The image and characteristics of the guides (together with what I know and have since researched) unfolded over time. And they come and go. The fox, I usually "see" when I'm struggling with baggage from my past or shadow self (and possibly past lives too - though I've never gone much into that). The Mongolian, I see him less often. He reminds me of my strength - and I rarely need reminding these days.
Another guide appeared whilst I was at a psychic awareness class, at The College of Psychic Studies (London). I just had an impression of a symbol drawn in the sand, and a rather angelic sounding name popped into my head (we were doing a focussing exercise with sand that night).
[Things often 'pop' into my head - or I sort of "hear" them - apparently, this is called clairaudience. More Lol. ...Perhaps.]
And I have one that "appears" whilst I practice meditation. She feels like someone is looking over my shoulder - listening to my chanting. Perhaps she's tut-tutting at my pronunciation? (Sanskrit).
