Driver's side: Put your right foot in, plop your ass in the seat, drag your left foot in.
Getting out: Put your left leg out and position your right foot as far left and near the seat. Lift your ass out of the seat, while simultaneously pushing wth the right leg to shift your center of gravity over your left leg. Duck your head and get out. A parade of emoticons to demonstrate the process.
Notice two things about Tracy's post: Both guys are under 30 and both are under 6' tall.
It's a little different for some of us (with the top on). I have to throw my butt in first and then pivot my legs in as quickly as possible. The idea is to leave yourself exposed to ridicule for the shortest possible period of time.
I'm young-ish, but I'm 6'3" and I found it to be pretty simple. For me:
Getting in: Put right foot in, slide in to seat at 45 deg angle, pull left foot in while turning. Hands can go pretty much any where, but no weight can be put on the windshield or steering wheel.
Getting out (this works for both sides): Put your inside foot on the metal area of the floor. Pull your outside foot outside of the car and rest your leg on the black plastic. Push yourself out with the inside leg until you can put your weight on the outside leg, then stand up while lifting your inside leg out of the car.