taking off the bottom grille is a kinda pain in the ass, but all it consists of trying to get underneath so you can see both side notches.
there are four or of them. you need to get a hand held flathead screw driver in order to push down on the tabs. but before you do that, you will see, i think, it is four pieces of plastic that run vertically in the "mouth" that the grille is attached to. you have to kinda push them forward. i took out both of them so i could paint them. make sure you prime them first, and clear coat them. make sure you get everything, put on several coats. i hope this helps.