68 Fastback Glass Help

I am removing the glass from my 68 Fastback, I have laid a blade against the glass and cut the old gasket all the way around. I can see the edge of the glass when I look at where it is sitting on the interior section of the gasket yet I still cant push it out. Do I need to take a blade around the outside of the glass? I hate the thought of going perpendicular to the glass especially near the edge as I know that's an easy way to shatter it. Any suggestions?