Night before my 3rd race

I have my 3rd tri tomorrow morning and I'm a little uptight. It is a 1/2 mile lake swim, which I have never done before, so I am a little nervous about it. I have swam a half mile in the pool before, but it has been a little while since. I logged 2 nice 3 mile runs this past week and put in a little time on the bike, but I haven't swam since my last tri and that was a 400 meter swim. I was pretty tired after 400 meters, so we shall see how I do in double that distance. Needless to say, this is why I'm a little scared about the swim tomorrow. I'm trying to stay positive and focused and not worry about it, but it is not easy. This is the weekend of a convention here in town which I wanted to be at tonight, and which would have kept me distracted from the race in the morning, but I feel I need to be in bed early tonight, and I still had some preparations for the race to do before I go to bed. So off to bed I go to rise early at 4:30am. I will post pictures and results of the tri later in the week. Goodnight.