UrS4boy

Having removed and replaced and removed and replaced my front bumper many times for various FMIC installs, I can offer the following, to remove the whole bumper, cover and aluminum beam as one assembly:

1. Remove the belly pan - easier access and then less complicated when re-installing bumper
2. Remove the front grills, ends first, centre last to access the allen head bolts. (Details in image below)
3. The two allen head socket bolts (No. 17 in the image below) (one per side) are easy to remove with an Allen head socket (6 mm IIRC), at the end of a long extension on a rachet.
4. Re-installing is a challenge because of the side clips (No. 8 in the image below) Have a friend help or at least have box to hold up the other end. Get the ends clipped in before intalling the allen head bolts.

I have done it different ways, including with the belly pan in place (that was very challenging)

Good luck.