Removing rear glass out of hatch back

Glass can be tricky. I use a sealant knife to cut the adhesive all the way around the glass. If the glass has attached trim you usually have to cut it off and replace it because it will not flex enough to get the knife down to the sealant. The attached are what the knives look like. However, if you have never removed glass, you would be well served to call a glass company to remove it. They have the tools and practice to get it out without damage.