As noted, depends on what you are starting with?
Next is how stock do you want it? Just stock height that rides good? Pebble beach, date code correct, OEM parts, perfect restoration original?
Just going off 'typical' old school Bronco lifts, need stock height springs and shocks. Track bar drop bracket removed, which is typically welded to the original. Drop pitman arm removed. Replace the caster correction bushings in the front axle (or leave them with power steering as it will drive real good with extra caster). But there are so many other things that could be involved. The more modified it has been, the more it will take to undo it. Leaf spring conversion kits once existed for the front suspension, that will be a lot more work. Drop radius arm brackets, long arms, full width conversions. Those will drive up the difficulity levels.