I did it on both R and L sides and the pin wouldn’t come off (lots of hair build-up). Given the limited leverage available to push the pin, I ended up inserting 2 flat pieces of plastic between the body and the wheel (it works with large flat screwdrivers too) and prying the wheel from the body. I also had to re-hammer the pin into the wheel as it had been pushed out of it by a significant amount.

Same here. The hair had slowly pushed the pin out and the wheel was rubbing and getting stuck.

It should. I have a 960 and the instructions worked just fine, the only difference being that the carrier plastic is gray vs. blue.

The replacement wheel modules sold by iRobot are supposed to work for “500, 600, 700, 800 and 900 Series models”, so they should all be the same.