I personally use the "TopSider" method and think it is a lot eaiser and CLEANER than to jack the car up, get under it, drop the belly pan and then pull the drain plug, empty the oil collection pan, etc etc etc... You can get TOPSIDERS and most Boat Stores. Personally I use the one from Griots Garage found Here
and am quite happy with it. For my car which holds 8 qts, I need to pause it in the middle and empty the topsider into a container, then continue as the model only holds 6.5 qts. It still is a lot fast for me and a lot cleaner to do it this way than through the drain plug. Some of the other Topsider devices will hold the 8 qts no problem.