I did the same last year. However I found that the side pieces of the door frame were not only screwed to the tiles but also GLUED!
As I pryed off the frame the colored glazing of the tiles, where the gule was, was ripped off. Leaving quite a mess.
I wish I knew what type of glue that was. It was quite impressive.
As for the base on the tub. I agree. It was only caulk between the frame and tub.
The best of luck.
Note: Our ruined tiles were replace with tiles taken from where a new vanity was to be positioned.
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