kind of a loaded question. with basic hand tools yeah it could take 12 hours. I put one on with air tools in about 6 hours and a floor lift. with a post lift I could do it even faster. It helps to know the truck well. I knew how to disassemble my front end from when I put my billet grill in so I didn't have to slow down to find the right tools. there are steps that can be skipped in the instructions.
directions in a nutshell.
remove both bumpers and grill.
remove stock body bolts and install blocks.
reinstall both bumpers with new brackets.
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