PB Blaster EVERYTHING several times the day before you do this, if your car is old enough to need its struts replaced. Mine will be 10 in May... 10 years of weather doesn't make certain bolts happy...
Anywho, the rear shocks together are the same price as one strut, so at the very least its a cheap maintenance item.
Floor Jack or transmission jack
Socket 14mm, 17mm, 19mm
Allen Wrench set
Pipe Wrench or Maybe Channel Locks
An impact gun takes away a LOT of work.
Might need a breaker bar, just put a pipe over a Socket Wrench
Remove the rear rear floor board in the trunk, then remove the front piece too. You should see the tops of the shocks now.
Jack the car up, put it on Jackstands. Take the wheels off.
Not needed to do it in that order either.
You have to break loose the bolt on the bottom of the shock. Jack up the suspension with the floor jack by the bottom of the shock, it helps. I had a **** of a time doing this even with a 2 foot breaker bar with a 4 foot extension. It's 19mm and you'll also need the 19mm wrench to make sure the other side doesn't spin. Beating the bolt with a hammer could help it un-seize, along with torching it. Just keep hammering and putting more leverage on it, it will come eventually.
Undo the top of the struts from inside the car, 2 14mm bolts. The entire assembly should fall out easily now.
Mount the spring compressor to the spring, and tighten it up evenly.
Undo the top 17mm bolt on the shock. It might not want to spin, the impact couldn't do one for us. So we took a 17mm socket and put an allen key through it. It was REVERSE threaded as a result, IE: Righty loosey lefty tighty.
Assembly the new shock using the old pieces. Make SURE you have the shock correctly aligned, note the position of everything when you take it out of the car.
This also would be an EXCELLENT time to put new coils on.
With the new shock together mount it back into the car, top first.. the 14mm bolts should be torqued to 22.4 ft lbs
Then the bottom, and one of the hardest parts.
You have to line up the shock with the 19mm bolt, I used a jack to compress the shock until it lined up. A helper also makes this a lot easier. Torque this to 116 ft lbs once you finally get it on.
With that done, do the other side in the same way. Put it all back together, and go get it aligned. You're done!
If you're ready to purchase the shocks, these are the ones I used: KYB GR-2
(affiliate link) You'll need two of these but they're not side specific.