Installation is the reverse of removal, be careful guiding the bottom of
the shock into the hole in the control arm on the way up, pulling the shock
back down with the spring in place is a little difficult.
Especially without the factory spring tool so again, you must
innovate. Stack a bunch of bricks, bags of sand, shovel dirt or bribe
the two fat broads from down the street to stand in the open trunk to
compress the springs far enough to thread the nuts on the shock rods.
What may be simpler is to take them off by removing them thru the top
towers and the panel in the rear firewalls. It's kind of more work, but
then the area is totally clear while you're working on the springs, and
you can extend them all the way before dropping them back down if they
don't naturally want to expand. You pull them out, mounting caps and all.