I tried longbedGTs way, but I’m not that talented so I bought a performance tool internal spring compressor to help.
I took the hooks off the end opposite the head.
Unthread the block.
Remove the lower block w/ hooks.
Work the lower block w/ hooks through the side of the spring.
Put the bolt up through the lower A-arm, block w/hooks and the shock hole.
Thread the block w/o hooks onto the bolt.
Spin the hooks around the spring as far down as you can, then tighten the bolt head through the lower A-arm. It holds the spring and isolator (if used) tight to the frame over the spring pilot.
Compress the spring as needed.
When I took the springs out to cycle the suspension to measure for and test fit some tires and wheels I tried just taking the lower A-arm bolts out, but the spring was pushing out hard enough to bind up the bolts.
I used the spring compressor to make things easier.
It may be the option that works for you too.