It's not that hard, but definitely can be daunting if you're not too into computers. Really the little RCM jig is just a plastic piece that slides into your right joycon rail and jumps two pins together that basically put it into developer/diagnostic mode. Then you need either a PC, android, or one of the portable payload injectors to get it into the hacked system. From there you can set it up so that it runs a virtual hacked operating system off of an SD card, and you can still boot into the stock firmware without altering your console at all.
It's relatively easy if you follow instructions and have an early switch. The later model ones do require you physically solder on a modchip, which I wouldn't have bothered with if I hadn't bought one of the early switches.
azure_gleam