I decided to do the removal this weekend. First things first, shop around for a plug. I went to Ace Hardware and HD and ended up using a plastic plug I found at Ace. It's 1" wide with a 1/4" deep base that basically snaps it into the hole.
The actual wiper, once you pop off the plastic end cover at the base, unscrews in a counter clockwise direction. Don't force or pull it off, just unwind it. Be careful not to scratch your paint.
Then you need to pop off the plastic trunk hatch cover from inside your car. I found this the most difficult part, mainly because I didn't know if I was breaking anything. From here, you can easily see the wiper motor and the counterweight bolted onto the hatch. I removed both and weighed them; came out to just under 3 lbs total.
I'll post pics later of what I'm doing. Well, here's a start: The plug.
Edit: Okay, scratch the white plug. I tried to dremel it down to fit and be flush, but it wasn't having any of that. So back to ACE I went, and found a better cap plug that was 7/8" and shallower. I used some silicone and plopped it right in. Then I added more silicone underneath.
BTW, the weight is located right in the middle just forward of the hatch latch.