I wouldn't sit closer than you usually do...unless you are really leaned back when you drive normally....you should be able to sit in your seat and comfortably rest your wrists on the steering wheel (without reaching/stretching)
1) Tire pressure: Front 42 Back 38
I use 45 in the front and rear
2) Sit closer than normal with seat belted locked in.
3) Use my ABS often.
You will want to slow down just before the turn and use your accerlation through the turn
4) Eat some cones.
OH AND YOU WILL 
5) Sit in on other people's non time trials.
This helps a lot....I like to have someone drive my car too (pick someone who really knows what they are doing
6) Walk through the course, draw the course, study the course.
Walk the course A LOT ...as many times as you can
7) Look 2-3 cones ahead.
If not more...try to memorize the course before you start driving on it and don't take your first run toooooo fast
8) Avoid a full tank.
Eh
9) Clean out anything loose in my car.
Everything loose in the trunk too
10) Launch the car. (This may be a problem seeing that I've only tried a couple times.)
Don't launch it just take off quickly
11) Turn earlier and less.
Really depends on the turn itself
12) Brake earlier and less.
Don't brake too much
