I have never done this before, but here is what I do know. Spray the bolts with penetrating oil first, and then use a impact tool to loosen them. If they do not come loose with the first try, you must apply heat using propane, or oxy acetylene. Bolts that are factory good are hard to find, so be careful. When the nuts and bolts are all removed, it should fall off, so place a jack under the bumper, so it doesnt fall on you.