Assuming you need to replace the entire door panel:
1. Start by removing any screws or bolts holding the door panel in place. These are typically located around the perimeter of the door panel.
2. Once all screws and bolts have been removed, gently pry the door panel away from the door frame, taking care not to damage either the panel or the frame.
3. Disconnect any wiring that may be attached to the door panel (e.g., power window controls, etc.), then remove the panel completely.