I think everyone handles this in different ways. Nerves are good as long as you don't let them get the best of you. I have had nerves destroy me before, but looking back I think it has more to do with how prepard I am. If I'm totally prepard, musically, then nerves are an asset because they keep you attentive anf focused. If just somewhat prepard then I let them get the best of me. So, for me, it just all depends on me and if I'm ready. Also, I find that the larger crowds seem to blend in to the furniture so to speak and therefore don't bother me as much. The smaller crowds have more of the intimate setting and gets me to thinking about other things rather than focusing on my music. Here again, it's just how I deal with it and what I have learned to be my catalyst of nerves. Being prepard helps me to be more focused.