installation of rear tailgate window motor on 1983 Bronco 302V8

Removal is easy. Manually raise window enough for access and removal of 3 screws and cut wire that goes under regulator to motor. Installation of
new one is hell. Trying forever to align teeth in regulator with teeth in motor gear. This alignment must be perfect for the motor to align perfectly with the flange in order to install the 3 securing screws. Problem is that the motor goes under the flange where the teeth meet so you can't visually align the motor and regulator teeth. Worse the non-removable plate over the flange that secures the tailgate locking mechanisms makes it even more dificult to see and align the 2 sets of teeth. It is a touchy feely type of thing and very frustrating. Anyone ever do this before and know some tricks or do I just tough it out or pay a mechanic?
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