I've struggled to remove window glazing safely until now. I wanted to pass along a technique that has made the process much easier. With just a simple garment steamer and a putty knife, the glazing practically falls off.
Leave the steam on an area until the glazing becomes soft enough for the putty knife to easily cut into it. Do your best to stay away from the glass. The real trick is only using the putty knife half way up the glazing.