I don't think it's that it's so much the recording process itself is particularly hard, if that makes sense.
It's really a matter of knowing where to stick a mic in front of a guitar cabinet, know how to mic up a vocalist etc etc and there is only so much reading you read about these topics before it just gets to a point where the only way to really continue educating yourself on the matter is to actually try this stuff in the real world and constantly refine your techniques.
Honestly, there is pretty much all you need to know on this forum already on how to "record" stuff per se. How to stick a mic in front of an amp, general amp tweaking, mic-ing up drum kits, recording DI tracks for bass guitar, recording vocals, all that shit is covered extremely well on the forum already and there isn't really any reason to go any buy any books.
Now that you're fairly well read on the topics (but if you feel you're not, just keep reading around here), what separates you from the top around this forum is the ability to hear at a more advanced level and their level of experience.
There's a lot of ear development and this comes from just listening to stuff, not reading stuff, so get out there, grab that mic, mic shit up and tweak until stuff sounds good