The rear window regulator has two rollers that fit into the window channel assemble. Using a piece of flat stock, a length of stiff wire coat hanger, fashion a gook to raise/lower window once the regulator is out. the two rollers on the regulator are held on with "spring nuts." There are four tabs on the spring nuts, they clip over a ridge on the "axle" get in your arm in there with a pick and pop two of the tabs over the ridge and then you can pop the nuts off and then slide the roller off the axle (stud.) Then you can remove the regulator once it is unbolted.
All that once you've removed the interior panel. I suggest first removing the rear seat lower, and then the plastic trim that mimics the seat lower along the interior panel. It has two screws holding it to the floor and it hooks into two clips on the panel. take the screws out, then lift it straight up.
If you click on the picture you can go to photobucket and expand the picture and see the rollers and the spring nuts on the regulators.