Guys, i have painted by grilles ( both top, lower and the fog lamp covers ).
I can tell you that i didnt remove my bumper, i took off all the covers in under 5 minutes!
This is what i did, i pulled off the lower grille then pulled off the upper grille. simple as that, just a little brute force and bobs your uncle they came out and once i finished painting them i simply pushed then back in.
I dont know where youre all coming from when you say you have to remove the whole bumper from the car because i certainly didnt. Ill try and post up some pictures.