Okay, post op. The initial application was easy. There was a slight burning sensation and a slight acrid scent while the cream sat for 10 minutes. Nothing too uncomfortable, I imagine actual waxing would be much more painful.
Wiping off the NAIR was a little more complicated and produced a much more powerful burning sensation. This could have been caused by the cheap washcloth I used, it wasn't anything fancy or smooth, just Walmart brand. I'd say the NAIR removed around 90% of the hair where I applied it. At present, its difficult to tell because of the redness. The test site from yesterday experienced the same redness though it went away after a little more than a day. I can definitely still see a few errant hairs right now, and I imagine more will grow out in the next few days.
Probably some time next week, I'll have to go for another treatment. If everything goes smoothly, I'll have to find someone to NAIR my back, that's impossible to shave effectively.