Just go and have fun....I raced my 1st last night and won my Category. It was sooo fun. Get there early and do a gradual workup on the course. I did a lap in my jeans and T shirt, just to get a feel, then got changed into my kit and started doing a lap. Stop for water, Clif Bar etc, do a few more laps. Then I did some hard efforts to get the heart going about 10 min prior to the start. The rest is history!!