Wheels. You need wheels. Go rent a suitable dolly that this thing will be able to sit flat on. Blankets or lots of old towels for padding. Straps to hold it down. Your biggest weight-lifting buddy (or two) to help you. (Better two: figure on pizza and beer for later.) If the owner has light colored carpet, etc., make allowances for big pieces of clean cardboard etc. to lay down on that in the path of the dolly: a few pieces will do because you can keep moving them along. Lift with y'all's knees. Nobody needs a hernia!
We put a new 36" Toshiba in my basement TV room a few years ago and lemme tell you, it wanted to go down there all by itself! Three guys holding back on it.