You can rent a pilot bearing puller from any parts store. Makes quick work of that job. You can also use "the bread trick" or the grease trick........... I guess I feel like a puller is easier and certainly not a nightmare. Anything can be a nightmare without the right tool
Make sure you get the rear main seal in straight, use a very light coat of RTV around the outside of the seal, clean that area on the block really well with brake cleaner... make sure the crankshaft doesn't have a groove from the old seal. Grease up the inside lip of the new seal so that it slides onto the crank nice and doesn't get ruined by running dry for a bit.
Pulling the old seal out is easily accomplished by drilling a tiny hole in it and screwing a sheet metal screw into that hole, then grabbing that with a slide hammer (preferably) or vise grips and yanking it out.
I would replace your slave cylinder while you're in there, might as well. Read up on bleeding those. They can be a pain.