It's probably easiest to do this with 2 people, but it can be done by a single person. You need to get that swingarm in the correct postion so you can install the shock bolts without putting any significant shear stress on them. Just like removing them, this is really only a challenge for one shock. Once you have one installed, it will hold the swingarm in place for the second shock. In the previous step, I installed the upper bolt with the new shock on one side (used some blue Loctite). I put some blue Loctite on the lower bolt, put it through the washer and the lower shock mounting hole and got it ready to put into the swingarm.

All those hurricanes from 2004 left me with lots of convenient, window sized pieces of plywood and I put them to use here. I slid one sheet at a time in place under the rear wheel. When I got that mounting hole on the swingarm close to position to line up with the new shock's lower bolt, I used that new jiffy stand as a prybar and was able to control the height with one hand while sliding that lower bolt in place with the other. Once you get that bolt in place you can easily get the nut on the back of it and tighten both upper and lower bolts. The second shock can now be put in with little challenge.

NOTE: I put the right side rear shock in first. I don't believe it makes much difference, but I suspect doing the left side first would be slightly easier since that lower bolt needs to line up with both the swingarm AND the belt guard bracket on the right side. This was nearly trivial because the front belt guard bracket was tight enough that it held the rear one pretty much wherever I put it. I was lucky, but this could be a case of not having enough hands, so do the left side first and then it's a non-issue.