remember the 6 Ps. Prior preparation prevents piss-poor performance. Know your set so well that you could play it from reflex, without your head being attached to you body. Once that happens, play it some more.

You'll gain confidence, but everyone is nervous when performing. Experience will relieve you of your nerves like nothing else.

Also, a SMALL amount (1-2 pints) of beer or 1-2 shots will help a bit. Any more than that and your playing will be affected.

Good luck, let us know how it goes!

Nathan