Mike --

The rear main seal sits in a seal housing, and is directly in front of the flywheel. The housing is aluminum, and is bolted to the block with (I think) 6 bolts -- and another two up from the oil pan. To remove/replace the seal, you first remove the housing.

When you remove the housing, you must pull it straight back. If you're careful, the pan gasket will survive -- with a touch of RTV. Note that the housing sits on two alignment pins -- you'll need to get something small (tiny chisel) between the housing and block to pry it back -- gently, gently -- one side, then the other, back again, and so on.

The old seal can be driven out with a punch and hammer. After the housing is cleaned, the new seal can be driven ("tapped") in with a small hammer, flat blunt object, or a seal driver. The best way is on a press with the proper size mandrel. (However, the last dozen I've done went in with a small hammer -- very, very carefully. None have failed, none popped out, and none were damaged.) Be prepared with a new housing gasket.

Examine the mating surface on the crank, and look for a wear groove. Note that you can insert the seal to a greater or less depth than the original. By doing this, you can position the replacement seal so it has a fresh surface on the crank. I like to install a new one about 1/16" further in. I also like to use a little Permatex aircraft gasket cement.

When you install the seal, remember to thoroughly clean the crank surface and seal lip and lube with clean engine oil.