Go to a good auto parts store. They usually sell the release tool. It looks like a flat blade w/ a hook on the ends.
You slide the blade under the trim, and it will release the plastic clips. The tool is a double edged deal, so it can be used from either side of the car. Plan on new clips, as they tend to break easily.
Use care on the trim, as it has a thin plastic "wiper" in it. The wiper is a seal that keeps $hit out from under the trim.
The clips are held on the body by small studs, welded on w/ a stud welder. If any are broken, the body/paint shop can weld on new ones, BEFORE they do the paint work.
Also, take the 1/4 glass out. It comes out in ONE piece, and is held in from the back side w/ speed nuts, and allot of goo sealer.