1. If you're required to memorize your pieces for a performance (which is very likely) make sure that not only your fingers know it, your brain and your ears also know it well. The reasons are that the better you know your pieces, the less likely you'll be overcome by stage fright and suddenly forget everything. Make sure you eat something before a performance.
2. Cut your fingernails two days before the big day. Don't wear any jewelry on your wrists because it will distract you. This includes watches too. No rings either.
3. Don't do all your practice a few days before. Smile!!! It shows that you're confident about what you're doing and assures the audience that it will be a pleasant experience for them.
4. When you're playing, pay attention to yourself and not to the noises around you. Listen to yourself. Stay focused.
5. Take a bow. Then turn to your left towards the piano. Just make sure that you never have your back to the audience when you turn.
