You do not have to remove the engine. You just need to remove engine mount bolts, jack it up enough to fit a 2x4 block between engine and mount and let the jack down to allow enough clearance as it is listed in the instructions already given to you.
You must remove the transmission, and this is pretty easy.
You have to drop the pan and unbolt the pump( with the pan still in the way ) and then remove the pan with the pump and pick up inside. Also listed in the instructions I already sent you.