Depends how good are you at soldering. If fixed some without removing anything but the rubber grommet/ boot. Just cut the bad section of wire usually already cut from opening and closing the door. Solder and heat shrink the broken wire back together.
It sucks doing it but can be done. Other wise pull the door panel unplug all the wiring connectors pull the wire though the hole in the door may give you more slack to work with.