HELP! New Motor rear main seal Leaks

Thanks all, some really great tips and advise. I've had the oil pan off once to fix a leak, that was my doing when putting the engine together. Not that hard. I have AlterKtion so no torsion bars. I am anal about oil leaks so I guess I'll be tearing it down. Does the upper seal come out easily with the crank bolted up but the main cap off?
I really appreciate all the feedback. I live in an HOA and they don't like me at all. Maybe if I drove a Cheby.