Howdy Roshelle,
Wow-good luck out there at your first tri!!! It will be so much fun, and you'll have the BEST time. But be careful, because once you do one- you'll be hooked forever.
Everyone had great advice. Just relax and enjoy the experience. You'll never get back your first tri, so enjoy the day and savor every moment.

The only other piece of advice I have is to take off your cycling gloves before the run. I ran with mine on during my first tri.

Have a great time, and be sure to let us know how it goes!!!!