use 2 big C clamps aways away from the center bolt & take off the nut. supposedly the special rounded center bolt is easy to come by but they typically are rusted & the exposed bolt threads are dinged from road debris so I crack it with a nut cracker then remove it then undo the clamps evenly till I can seperate the leaves then take the main leaf in to be arched. First before undoing anything jack up the rear bumper with a bumper jack till the wheels look right in the wheelwells to your satisfaction & note how many inches of increase that is for the shop to add to your leaf.