Chalk the tire sidewalls, and check to see how far over they're rolling after your first lap (that will rub the chalk off) and inflate to compensate if your chomping the rims...

Also, I assume your on stock seats, so pull the belt out all the way and lock yourself in (keeps ur ass in the seat)

Remove the spare, run on like 1/4 of a tank (bring a few full cans)

Um yeah, have fun, dont crash?

good luck, POST PICS!!!
~Nate

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95 Honda Shadow ACE 1100.
1999 Plymouth Neon Expresso. 2.4 swap, 10.5 to 1 comp, big cams. Autocross time attack vehicle!
2012 Escape, 'hunter" (5 sp 4cyl)