you shouldn't need brute force (or ignorance) to fit springs.
jack vehicle up and support by chassis (whichever end you are doing, front or back).
keep axle off of springs whilst locating the spring into the mount of the chassis, then raise other end of spring upto the shackle end, make sure all bolts are loose, including the shackle to chassis bolts.
both ends of the spring should go into respective mounts easily.
then bolt on your axle.
stick the vehicle back on the ground before fully tightening the bush bolts.