You'll do great!!!
I was scared the whole week before my first race. Before the race began, I was talking to a girl in my tri club, and she said something to me that really helped me relax. She told me to enjoy every minute: the scenery, the sounds, the atmosphere, the feelings. She said not to look at my watch and worry about times. You can't ever get back your first triathlon, and it's a very special day.
All throughout the race I kept thinking about that. I never looked at my watch and really enjoyed the experience. And I actually did better than I thought I would. I think it's because I was so relaxed and had fun. Doesn't mean I wasn't nervous as all heck, but I had a great time.

Also, I'm seriously OC (obsessive/compulsive) when it comes to checking my gear before a race. I lay everything out, then check the list twice, pack each sport into a separate bag, then finally put it in my car. At the race site, I set up my transition area, listen to music that gets me pumped up, and warm up in the water. Then "it's on."
I always pack way more than I need because if I have it, I won't need it.

You'll do GREAT!!!!! Please let us know all about the race when you finish!!! And post pics if you get any!!! Good luck!