I successfully pulled front and rear glass from a coupe at the junkyard - it was a really hot day though which was miserable but probably helped make the seals more pliable - I got the glass out with the seals intact (they were still good). I started at the sides and gently pried and pushed the seal out from the inside of the car. Use a dull screwdriver or scraper to work the seal out and something wide and smooth to keep it from popping back in as you move around the top of the windshield. The glass comes out (and goes back in) with the metal trim in place. If the seals had not been good I would have just sliced them away from the inside with a sharp knife or Stanley cutter tool.