From: Meltzer's Driver Training Center

Find a space at least the length of your vehicle plus six feet. (An expert can do it in less space.)
Remember to always observe all ways for parked vehicles, traffic, pedestrians, etc.
Pull up next to the vehicle about two feet away with your rear bumpers even.
Remember to always observe all ways for parked vehicles, traffic, pedestrians, etc.
Back up about two feet. Stop. Turn the steering wheel all the way toward the curb.
Remember to always observe all ways for                   845-297-3966
parked vehicles, traffic, pedestrians, etc.
Back up until your car is at 45 degree angle with the curb. Stop. Turn the wheel away from the curb.
Remember to always observe all ways for parked vehicles, traffic, pedestrians, etc.
Back into the space.
Remember to always observe all ways for parked vehicles, traffic, pedestrians, etc.
Straighten the wheels and pull forward. Try to leave equal space in front of and behind your car.

Ta Daaaaaaaaaaa..... Oh, wait. Maybe the following would be easier.

Also, from the NY Driver's Manual Online,
"After you park on a hill, be sure to set your parking brake. Just in case the parking brake fails, turn the wheels so they will keep your vehicle from rolling into traffic":

1a) If there is a curb, turn your steering wheel all the way away from it if you're facing uphill, or

1b) all the way toward the curb if you're facing downhill.
If your vehicle starts to roll, the wheels should stop the vehicle at the curb and prevent it from rolling downhill. This method works best where the curb is relatively high.

2) If there is no curb or a very low one, whether you are facing uphill or down, turn your wheels all the way toward the nearest side of the road. If your vehicle does start to roll, it will probably roll away from the street and traffic."

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