I can read for myself perfectly fine, even when emotional...EXCEPT on one specific situation, on which I can hardly read for myself at all. Even though I can do it; I just have to calm myself down and be very sure about the...guidelines...for what I'm doing. For example, usually whether I read reversals or not is decision I make just as the cards come up. I go with whatever feels right, and easy peasy, seems to work. But if I'm trying to read about my blind spot and I do that...it's a mess. If I declare beforehand whether or not I'm using reversals, much better.
I like the suggestion upthread of using the LWB. I think that if you usually don't use the LWB, and you're having trouble reading for yourself, it might help to go back to something rote. On the other hand, sometimes I focus up by doing something completely different and using a deck that feels foreign to me, something I don't use, something with unusual imagery.
Frankly, though, if I didn't think a person could read for themselves at all, I'm not sure I would do tarot anything. I'm a very private person, and sometimes very detail oriented, and I don't wanna go to someone else each time my neurotic self is doing some deep soul searching, you know? I mostly have other people read for me if the question I have is something very definite and external.