I relate to most of Kevin's advice about singing too, especially in finding the right note to start on an' all. The difference for me is that the most comfortable place to start is a semi-tone or so LOWER - must just be a testicular thing! It seems to me that there are excellent performers who aren't very good musicians, and vica versa. The ones who are most engaging (for me) can be the averagely good musician who has found a way to warmly relate to the audience as a "friend". I think we can really limit ourselves in the sole pursuit of musical excellence - sure, it would be a wonderful thing to have but not if you feel so scared/depressed at not having attained it, that you are unable to enjoy and share your "sound".

I want some beta-blockers. I practice with a tuner too - I've looked about for a singer's pitch pipes (yeah yeah - should learn the whistle) but can't find something appropriate in my neck of the woods. Anyone got any suggestions?