You don't need to disconnect the rear sway bar link... you just have to pull the rear shock up and push the lower control arm down(after you took off the 2 bolts of the lower control arm) and wiggle the shock out... it's really easy...

The bottom shock nut is only 85Nm... which is I believe about 70ft/lb... If you have a 1/2 inch 18mm socket, you should be ok... you don't really need an impact wrench to do the job, you will need to use a 1/2 inch 21mm socket probably with a breaker bar or if you have a 1/2 inch torque wrench, you would be ok. With a 3/8 breaker bar or torque wrench, it would be kinda hard to break loose the 2 lower control arm bolt which is at 135Nm... ~100ft/lb I believe...

No specific degree offset for the 13mm wrench... as long as the tool is not flat... I bought mine at Harbor Freights Tools... and the wrench look like a "z"...

Make sure you take the bushing and the washer off of the original shock... it could be rusty... I used a 2 jaw puller to pull the washer and the metal tube insert off the original shock. To assemble the new shock, you would have a wash, a bushing, the shock mounting bracket, then another bushing, and then another washer, and then the nut to hold the spring down... you'll know when you take apart the strut...

Without an impact, it would just take you longer to take out the 2 lower control arm bolt, these are ~4 inches long bolts... you would have to turn forever to get them off...

I didn't remove anything except the spare tire... keep the spare tire rack lowered, then you can access the 3 top nut from the spare tire side... but you gotta reach in there to get to the 3 nuts... you will kinda be hanging in the middle in a pretty uncomfortable position, but unless you have a lift to get the car up high, you just got to twist and reach in... The whole process takes about 4 hours or so if you haven't done it before...

Good luck... any more question, definitely let me know... coz I know how tough it can be