I swapped new motors into my doors about 15 years ago. I can't recall much except replacing the rivets with bolts instead. Turns out, as usual, that the old motors were perfect (and tossed) and that the windows simply needed the standard rewire with relays. Look into that also if you are replacing thew motors due to being slow and weak. Replace any worn out felt guide blocks while at it.
What I'd like to know is what's the easiest/best way of removing an entire window regulator and channel tracks from a door and then reinstall? I have new door glass to install, along with replated channels and new guides etc. Removing them from a parts car is very different to how you may remove if planning on reinstalling for a resto. Can any of it be removed as a complete assembly, or piece by piece?