In most of Australia, land which was previously zoned as "rural living" has secretly been rezoned as "Farming" which means you cannot build a house if it is less than 100 acres. And you sure as hell cannot build without the design being approved. And then unless you can get a "Certificate of Occupancy" you can't live there.
I never said it's "hard", I said it's glanced over, i.e. never mentioned in these types of videos despite it being (I assume) something that requires a not insignificant amount of time. And no, I don't expect it to be described in excruciating detail, I'm just saying it's usually not mentioned at all.
In many parts of world it is pretty easy to acquire land out in the middle of nowhere and basically do whatever the hell you want on it.