I would recommend you drain the trans fluid, it helps tremendously to tilt the engine upon removal of the transmission. The result is trans fluid leaking out of the tail shaft seal. If you prefer not to, a heavy duty latex glove, a little rtv, and a hose clamp works well.
Get the right tools and you won't have to tilt the engine to get the trans out. They make a cap for the trans tail shaft so you don't loose the fluid when you remove the driveshaft.
Good luck changing the rear main, they are fun lol