Old spring can be a nightmare to get out. The way I do them is unbolt the shocker and the anti roll bar, put spring clamps inside the spring up through the hole in the bottom arm. You need to do this as there is no room on put them on the outside. Get someone to force the arm down as far as possible (standing on top of the drum works well) then lever the spring out. Don't undo any other bolts as chances are they will be siezed and will snap.