It's not necessary to remove it. Back when my dad was alive, he could get in behind it to hold the retaining nut in place, which is the hard part. The last couple of times I did this without an assistant, I loosened the bolts on the compressor and was able to move it out of the way just enough to get in there. No need to discharge the system or unbolt the lines, just unbolt it and it'll move enough.
I don't see one on RA for $105, but if I were doing this job, I'd buy the Hitachi ALR0009 for $142.89 + whatever you pay to ship your core back. I bought the Hitachi from them for my truck, and it was drop shipped directly from Hitachi's facility in KY. I think this is the equivalent to a Nissan brand remanufactured unit at a much better price. Looks they're about $350 from a discount online dealer.
About 7 years ago, I bought what I thought was a Hitachi for my Q from someone who had one for sale here on the forum. I don't think it was intentionally misrepresented... I think whoever sold it to him screwed him... anyhow, it lasted for about a week. The autopsy showed that it was a total pile of garbage... they had left some wiring inside in a place where a rotating part could rub through it. Full of Chinese components that were much cheaper looking that the Hitachi. I actually ended up rebuilding my Hitachi by replacing the diode pack. Long story, but I had them on hand from doing this on my first Q, and funds were tight, so I had more time than cash.
Save yourself the headache of doing this job twice. If your battery has some age on it, replace it at the same time...
Oh, here's a coupon code to paste in to the "How Did You Hear About Us?" box at RA. 5% is better than nothing... 9157774085518432