Those tools work for crap on fastbacks because there is so much sealer (at least the ones I've done). Take a good sturdy putty knife and wedge it inbetween the moulding and the outside sheet metal. Staring with the bottom horizontal moulding, pry in towards the center of the glass and wedge screw driver between the exposed clip and lip of the opening. do this for a couple clips and you should be able to pull the molding straight up. Pry with the putty knife to release the remaining clips.
"If I can't fix it, I'll fix it so no one can !"
1969 Mustang LE600 Sportsroof - Groovy Green
1969 Mustang LE600 Coupe - Flower Power Red
1969 Mustang Sportsroof - Dark Jade
1969 Firebird 350 Conv - Mayfair Maze
1968 Cougar Hertz XR7-G (project)
1959 Oldsmobile Super 88
1963 Jaguar XKE Coupe (project)