Remove the plastic Phillips screw towards the front of the door panel.
This screw is part of a two-piece securing mechanism. Do not apply force directly onto the screw head, because it will continue to slip into the plastic clip.
Use a flathead screwdriver to remove the plastic clip that holds the screw.
Remove the plastic cover at the base of the C-pillar by pulling it directly away from the window.
The cover is held in place by a metal clip, so some force will be required to free it.
In addition to the metal clip, two small tabs at the bottom of the cover keep it in place. Gently lift the corner of the door panel to remove the tabs from their respective holes in the door.
Using firm pressure, pull the door panel away from the door. Start at the top right, and work down the side, across the bottom, and up the opposite side.
Multiple clips hold the door panel in place. the door panel will jerk as each clip is freed from its position.