70 duster front and rear screen removal.

Careful use of a putty knife from the inside is the way I like to do it. Pry the lip of the rubber gasket over the pinch weld. Work it slowly and evenly from top to bottom until it comes loose. The front is much more likely to break than the rear, so, be real careful not to get the glass in a bind. If the windshield (front windscreen) is available new where you are, I'd just get it and not worry about breaking it. It may be cheaper to just get a new gasket and cut the old one to save the glass if it's in real nice shape.