It has been quite awhile since i changed leaf springs, but, i put my truck on jack stands & blocks
then i undid the U bolts holding the rear end to the springs, letting the tires sit on the ground
the springs were then free hanging & i pulled them out easily, while they were out, i took them to a spring shop & had them re arc them & then they replaced the bad springs & used new spring clamps to put it all together. I took them back home & after finally rehanging them, i lowered the truck back down to the rear differential & used new U bolts to buckle it back up
I used a degree level to make sure the angle between the transmission & rear differential were set at specs
it was a chore, but, interesting