I've got a bunch of pics of bumper disassembly in this Flickr album:
Custom Lower Grille. Basically you remove the fog light assemblies, the bumper supports (big funky shaped piece on outside edges of bumper), and then you can work the clips out for the grille surround/fog surround assembly. The assembly pops out the front and you can then separate the fog surrounds from the grille surround. It's a pain in the ass and the first time I took it all apart it took me longer than I care to admit haha.
IMG_20170225_144515 by
Tony G, on Flickr