Boat in the water or out of the water? I knew a fellow who sunk his boat after removing the engine while the boat was in the water. He had a hose hung up above the water line. The hanger came undone, sunk the boat.
Other that that, I would start by removing accessories to lighten the motor and reduce the risk of extra things banging into the wood work on the way out.
If the motor is going back in, take lots of pictures with your digital camera so you'll remember how it all goes back together later. Wouldn't hurt to label wires and stuff too.
Just keep thinking of all the money you're going to save by doing it yourself. After all the skinned knuckles heel, you'll probably even think it was worth it.