[Dobie Gillis]

This is from the 1954 section of my '54/'55 Merc service manual. The '55 section doesn't address latch removal.

After you've exposed all the fasteners remove the screws from the remote control base (where the inside door handle attaches) and unhook the control arm from the door lock.

Remove the inside cover plate.

Remove the door lock cylinder retainer and remove the door lock cylinder.

Remove the cap screw that secures the lower glass run to the door panel.

Remove the cap screws that secure the door lock assembly to the door panel. Lower the lock assembly with the inside locking rod attached and remove through the access hole in the door panel.

Reverse the procedure to reinstall.

Going by this it looks like you don't have to remove the glass run, just the cap screw. Again, this is for a '54; a '55 may differ.