Good luck with it. Just walk in there with confidence and keep your cool....the rest will come to you. Not sure how/why....but for me I've had interviews where I was really nervous and I've had interviews where I've been dead calm and collected, almost like I didn't care whether I got the job or not. Needless to say..the interviews where I stayed calm are the ones I rocked and got me the second interview.
I can tell you this....I've always been the type of person who likes to be on the go and outside...more of a keep active, do physical activity kind of guy. For the last two years I've had a desk job and alot of days it drives me nuts. I'd much rather have a more active job, but I don't know where around here I could find a job that is going to pay as well as I'm doing now.