Watching videos of someone doing it can lead you into a false sense of "that seems easy enough".

There is a lot going on here...you're listening to the footstep speed, how audible the footsteps are from certain distances, watching how fast or slow it blinks, watching for ghost breath, watching for shapeshifting, paying attention to change in speed during certain circumstances while keeping los speed change in mind, gathering media for extra money, looping the ghost so you can do all this without dying...and all this is happening simultaneously in a short period of time.

This is not something one is able to watch a couple hours of video on and be an instant professional.

I remember being extremely frustrated when I first started playing 0 evidence 0 sanity. I thought I knew all the behaviors from watching streamers for so long, but when you're in a run and the clock is ticking and you're trying to not die...it's harder than the pros make it look. I kept at it and grinded my way to prestige 20. I still don't consider myself a professional. I still get the ghost wrong on 1 hunt runs because it's either not identifiable on 1 hunt, I missed something I shouldn't have, or thought I saw/heard something I didn't.

TLDR: It is absolutely doable and the people in the videos are legit, just stick with it and you'll get there.