Yeah it's pretty tough. The right way to do it is to drop the motor out of the frame and flip it so you can install the pan drop down style. There is a bracket on the frame that's a pain in the ass to get one bolt through.
Pick up a new metal gasket and some high temp rated, petroleum resistant silicon gasket material. It will leak if you don't use it (I learned the hard way)
Just take your time and be patient.
I installed mine while the motor was still in the frame... So it is possible.
Get some bearing grease to goop onto the oil pickup tube while you're putting the pan on. (It likes to fall out). Also why you're in there, pick up some new o rings for the oil pick up components while you're at it :thumbup:
Good luck broseph