Just did this...
I just did this last week with the engine in my Scrambler. I loosened (not removed) all the bolts that hold the bearing caps, then took a nail punch and drove the seal out from one side out the other. Just be careful with the punch, make sure you don't destroy the crankshaft or block with it. I've heard you should use a brass punch, but I couldn't find one so I was just real careful with a nail punch. There is metal inside the seal and this is what you want to "punch" out. It took a while to get it to budge, but once it did it was easy.
I'd never done anything like it before so I'm no pro, but it worked, and the leak stopped!
1982 Scrambler 258, T-4 (blown), d300, stock