I go at it from the basis of what's the worst that can happen. If you did freeze or get something seriously wrong it's not life threatening is it? Ok you may be a little self conscience but the more you play the less uptight you'll be. I watch performers who appear concerned they might get a lyric wrong, so out come the lyrics,the A4 sheets. Your giving a performance of a tune/instrumental and audiences generally are on the side of the performer and appreciate it takes some ***** to get up there and do it. Even the best fluff a chord,forget lyrics.Yes you should be keyed up for it,that's natural.. but my personal mechanism is to keep it in perspective. Steve