all great advice...
I personally could never do a lap at anything more than 5/10ths without a seat though. unless you're way thicker than I am, ( 5'10" and 195lbs) I'd think about the seat ahead of time. I think that makes alot more difference than what kind or even IF you wear gloves.
If you wanted to, you could call the Sebring shop and see if you can set up a time early your first day or the day before and have one poured. Or if the race series parts trailer is there, borrow a similair sized on. It's always done and people always take good care of them in the Skippy family.
besides that. I'd say just don't forget to relax and just soak it all in...
just my 2cents
Roger