Take a deep breath in, and breath out!! Now RELAX and ENJOY!! You have trained hard for this and know you know what to do.
Stay focused and do what you know you can do. If you fall don't let it flulster you its just a fall and it won't be your last when you compete - remember falls and mistakes happen. Stay focused and make the rest of the meet the best you can.
Most of all HAVE FUN!!