get a dremmel pull the bumper and cut away the center piece... all i tell you is,, you are going to see three little tubes around the fog light hole those ur going to use to hold ur fog light,, if you cut one it will sit crooked and look bad... and as ur cutting measure the fog light to the holes to make sure ur doing it right it took me around 1hr to do it on a brand new bumper and about 3 cutting disk cuz the angles makes them break.. good luck... oh and google is ur friend i would do some reseach...
ps when ur putting the bumper back with the fogs on its going to be a pain to put it in be patient and if you have some helping hand around use them.. (i did it alone)...