You want to use the tool on the left on joel's picture. I actually posted a how to on this a couple of years ago but the thread search tool is out of service right now...
What I can tell you is that there are several of the plastic clips around the rear window and they are brittle so be gentle!! One of the outer points of the arrow grabs the side of the clip, GENTLY - pry the clip in toward the center of the window and you should feel/hear the trim "pop" free from the clip.
If you're ever in the NJ area and want to do this, I can do this in my sleep!! I also have a few tricks for replacing the clips with the window in (technically, you can't get new ones in unless the window is out...)
Good luck.
Paul