[EverythingMusic]

Part of the problem is that you are trying too hard to make it perfect and when you do that, you put pressure on yourself and tense up. Lots of expirence helps and so does the realization that you can and will make mistakes and it won't be the end of the world. Just keep going and relax. Have fun with it. I often joke with my audience before I play.

Try this, record yourself during practice. Record it as if you are going to produce it. That always makes me want to get it perfect and it never is. That may give you the same kind of feeling as in front of an audience. If you can learn to overcome that, then the rest will be easier.