i drive a '65 willys cj5, the wheel base on it is really short and makes for some interesting climbs. between the 5 i have now and the 5 befor it i have been wheeling the short wheel base for 20 some years and i have learned some things about this. there was a coment made about the use of a clutch on a hill. i NEVER use it to stop. if the jeep is going to stall, i let it stall. i then work out the plan from there. before i push in the clutch for a restart, the brakes are firmly applyed. one habit i employ regularly to start on a hill is to keep every thing engaged and just start the jeep in gear. this is a very controled way to get going again on a hill. if the jeep is a little floded and needs to have the carb cleared out (the gas pedel needs to be to the floor for this), i use a hand throtle on the gear shifter for this. that way i have a foot for each peadle, the clutch and the brake, and not trying to two foot the brake and the gas.
i NEVER NEVER back down a hill with out the trany being in reverse. it the trany is in neutral or the clutch is in, you have no control and can very easly get into huge trouble. i have even started the jeep in reverse to back down a hill and keep control. another tip is to not dig in on a hill. this can be just enough to send you over backwards. sometimes its just better to let the jeep stall.
and yes, as allready stated, allways keep the trails condition and obsticals in the front of your mind. this is whats called picking your line.