Windshield gasket replacment

IF I'm not saving the gasket I cut it with a razor knife on the outside. Then take a smoothe edged frosting spreader or similar tool and run it between the glass and gasket across the top and sides inside to loosen the sealant grip and once I am confident that it is loose I sit in the middle of the seat and put both feet placed about 6" or so from the sides ( just inside the curve) and apply steady pressure until it starts pushing out,once you feel it start to push out,slowly decrease pressure so it doesn't pop out too fast,you just want to break the grip of the sealant,then go outside and pull it out by hand. Be careful of the wiper pivots so they don't chip the glass (use a towel) and also make sure the soles of your shoes don't have anything on them that can scratch the glass. The warmer the sealant the easier it will pop out. The cold makes it stiffer. It's pretty primitive but works great.