Drain all the fluids in the tranny and engine. Disconnect the drive shaft, exhaust, engine/tranny mounts, shifter, fuel lines, wires, etc. and use a cherry picker to pull the engine and tranny at the same time. Leaving the tranny in there sounds easier but its a pain trying to line everything back up to mount again. Just do it outside the car and you are set. To clean the engine compartment I say tooth brush, gloves, bristled brush and some cleaning solution/degreaser should do the trick. Goggles too... Try some of that spray on rinse off stuff first... I have seen some pretty good results especially if it saves you some time and just use some elbow grease on the stuborn parts.
Kevin