The OP has an early Golf The head liner had to come down because its close up against the windshield and the rusty flange in sits in.If you want to get that edge tool around the glass (to cut the sealant) and clean up the rust and prime/paint (why else would you need to reseal the wind shield) you might as well spend 1/2 hour and get the headliner and pillar trim out of the way.