Have fun. That is the best advice I can offer. Enjoy it, you are doing something so few people ever will do, step on a platform and lift in front of a crowd.
If this is in the middle of a training cycle and it is for the experience you probably aren't going in with goals so it should take the pressure off big time.
What we think, or what we know, or what we believe, is in the end, of little consequence. The only thing of consequence is what we do. -John Ruskin