I just pulled one yesterday to size up the paint rubbing/chipping issue and found it's pretty easy to remove the tail lights. As indicated, remove the little cover then, using a large blade screw driver, unscrew both large wingnuts being careful not to drop them into the panel. When both nuts are removed the assembly can be removed with a little jiggling.
I did discover so paint rubbing and plan to pick up some touch up paint to repair. I also plan to deburr the edge of the assembly.
2012 FF Ti HB Sonic Blue, Built 5/7/12, 401A + Parking Technology Package and MFT w/NAV 3.0.2 -> 3.2.2 -> 3.5.1 -> 3.6.2