there are two methods, first you can remove bumper brackets from chasis, or you can remove bolts holds bumper on brackets. first one is easier but more work to do. second one is faster but harder to reach.
before doing both ways, you need to remove front grille by removing 4 screws at corners. then you can reach bumper bolts.
ive done it and the easier way is to take the whole thing off with the bumper brackets. if you have bumper with flares those bolts with be rusted so you will need new ones, same with the crome bolts if it has chrome accents.