Dr. K:
I wouldn't worry so much about tires, setup, etc... for your 1st/2nd race weekend.
Your weekend should be as uncomplicated as you can make it so you and "Garth" can focus on:
1. fun
2. seat time
3. experience
4. staying out of the way(but staying on your line to be predictable for everyone else)
5. checking your mirrors (see #4 above)
6. putting the car back on the trailer (take it home) the same way it came off
7. fun.
There is plenty there to keep you busy. If the car is safe ... focus on the rest.
Have a great time!
