I think you might need to decide what you are nervous of, the actual event, i.e. swim, doing something silly and thinking you will look daft, mechanicals.
There are some things you can't sort and some that you can, focus on those you can, i.e. how to fix punctures, knowing the rules etc.
Nerves are good to a certain extent but this should be the sort of 'first date' nerves that are slightly giddy and not let them build to the 'swimming with sharks' type of nerves that make you wee yourself.
Get some paper and try to plan out your week. Work back from the day to today and then add in the givens, if you are working etc.
Then add your training sets that you will do up to the race.
Then add the bits that you need to do FOR the race, registration, racking, preparation of kit.
There shouldn't be a lot of time left to worry in, try to think back to your first race in a single discipline, my first 10k I went to the toilet 3 times before the start and had sweaty palms, that was only 10 years ago, now I ride 50 miles to a 1/2 marathon, turn up late, and you just get on with it.
On race day try not to watch the faces of others as there will be others who are scared and this won't help but do watch what others do, most are very focused on getting kit ready, getting to the start with a bit of time to go and then getting on with it.
I am sure you will do great but if in doubt on the day, don't be afraid to ask someone, don't pick the guy with the fastest looking bike and kit, they are probably too focused on them selves, look for someone who looks comfy, relaxed and returns you eye contact, they probably want to chat as well.
Race well
Edited: 25/07/2012 at 17:52