Oh, I understand what you need to do. It's like losing weight. It's fairly simple.

And at the same time it's borderline impossible proven by the fact that people can't do it, even though everyone understands and roughly everyone agrees on how it works.

So the actual "trick" turns out to be understanding what keeps people from doing the necessary things that they all agree on are important – like treating code reviews very seriously. And getting that part right turns out to be fairly hard.