I hope that everyone had a great Holiday weekend!
Some of you lucky folks are still on vacation and that means you have ample time to finally address that slowly operating driver side window or install those rockin' speakers that you've been wanting to do for years. The first step to repairing any of those parts is to remove an interior door panel so here's a concise overview on the procedure:
1) Open the Regal's door. Lower the window completely.
2) Remove the door panel retaining screws located around the door panel perimeter using a Phillips screwdriver. Remove the door panel retaining screw located inside the inner door handle bezel cup using the Phillips screwdriver.
3) Pry the window and lock switch bezel from the door panel using the trim tool. Disconnect the body harness from the switches and set the bezel aside.
4) Pry the door panel off the Regal's door using the trim tool to unseat the plastic door panel retaining pins. Lift up on the door panel until the upper lip clears the window well to complete the removal process.
5) Lower the door panel onto the door, making sure to align the upper door panel lip with the slot in the window well. Align the trim pins with their respective anchor holes in the inner door skin. Push on the door panel to seat the trim pins (this may require you to hammer on the panel with your fist to fully seat the pins).
6) Plug the body harness into the window and lock switches. Snap the window and lock switch bezel into the Regal's door panel. Reinstall the door panel retaining screws to complete reinstallation.
7) I had to replace the side window on one of my customer's Regals so if you need to replace any of your side windows then I recommend doing so at this juncture. OEM side window replacements are quite expensive, flirting with the $400 mark at dealers and $270 or so from such discounted OEM parts sites as gmpartsgiant.com. Shop around and there are reasonable deals to be had!