I'm in the middle of a stereo install, and don't know what this thing is, but it seems to be holding the kick panel in place. Do I simply pull hard like on the driver side? Thanks, guys.
Unscrew that guy like a nut then pull the panel back towards the rear of the vehicle. After you've removed the doorsill plate.
The little cover (with the arrow in your picture) will just push back on but it has to be unthreaded for removal.