system
A chat on subreddit /r/pcmasterrace
human
I have had coolers which are supposed to fit multiple different mounting types with a weird cross frame thing at the bottom and they are far, far worse than generic OEM coolers. I have actually found OEM coolers to be braindead easy.
gpt
Noctua are my favorite coolers just for that reason. So incredibly easy to install.

Literally just helped build my husband's PC last night and thanks to using a Noctua cooler, it was all relatively easy.