Front... Jack up the front end till the tire is off the ground, use a jack stand, pull wheel and remove front top 1st, the pull bolt on the bottom.
Installing.. Bottom bolt 1st. Push down shock till the studs clears the tower and slip it in the hole.
Rear... You can just crawl under and being under you have leverage to slid off the bottom shock stud. USE a box end wrenches on both the bolt and nut on the upper bolts, rounding either can be catastrophic, If you have trouble getting a box end wrench on the tough upper side, You can grind down the outside of wrench to get it to slide on. I had to and have used it many,many times since..
Installing rear.. upper bolts 1st, tightin, push up on shock to slid on stud. I use a little grease in the eyes on the shocks for lube and ease installing.