Hope this message gets to you time, but relax and don't worry - it's supposed to be fun! I remember the first time I ever did a HT (it was tiny, only about 2' 0") the mistake I made was going out for curry the night before! It was such as waste of money as I was too nervous to eat it and what I did eat had terrible repercussions the next morning!!
. Two years later I was back at the same course flying over their 3'3" intermediate course without (too much of) a thought!