First thanks!
Second is this something a backyard mechanic can do? One clue to my ability was that I originally had no idea what you were describing. But I have rebuilt a lawn mower engine and even replaced a set of brakes once.
It would seem that if one jacked up the frame with a floor jack, removed the tire, then supported the spring with a bottle jack the parts could be removed and new installed then move on to the other schackle on that wheel. But maybe it is more complicated than that?
my guess it might take a torque wrench which I would have to buy.......and make sure my floor jack would handle the weight.
Or is this best left to a pro due to other things I don't understand?