The FSM makes it sound more complicated than it is. Ignore the entire section on the knuckle centering tool. It’s only applicable if you change the knuckle, or the shims have been mixed up. Keep the shims together, as in driver’s side top, driver’s side bottom, etc. The total thickness is critical. Reinstall them as they came off. You’ll need a 54mm/1.25” socket. The outer c-clip is troublesome to remove without a pair of pliers like this:
