What year and model do you have?
It would be helpful if you detailed the year and model of your car as there are several differnt approaches for windshield replacement. The older models <123 usually have a rubber gasket and a sealing strip whihc needs to be pressed into a U in the gasket tightening the set-up and creating the seal around bot the glass and sheet metal. Later style cars 124+ for example, the windshield is glued into place and the outer seal is more of a trim component than an actual seal per se. The glued windshield should be replaced by knowledgable shops otherwise you'll end up with a mess of glass all over the place once it breaks on removal. These require special tools and pre-heating usually to help soften the glue while it is cut away with a fine piano wire or the such.
1987 300TD 265K mi Intercooler (Hans)
1985 Jag XJS 129k mi 5-speed 178 mph (Evil Kitty)
1975 Jag XJ6C 75k mi (Cool Kat) SOLD
1975 Corvette 4-speed 59k mi (Hot Lips)
1983 Jeep CJ-7 284k just doesn't quit (Venerable)