At least in the 40's Buicks, the beltline molding must be gently pried off with a putty knife or similar flat blade. The retainer is usually completely rusted out. I made new retainers out of stainless. Look here:
http://www.roadmachine.fi/Buick/september2009.html
The window molding is tapped in place if I remember correctly. There might be tiny screws hidden behind the glass channels. Anyway, everything must be removed prior - the window and it's channels, everything. The moldings are made of thin brass, and could be distorted easily. You'd really should get yourself a shop manual - this is where it pays off
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