In general don't start a startup you're not willing to work on for ten years.
Aim to be the best in the world at whatever you do professionally. Even if you miss, you'll probably end up in a pretty good place.
The second part of how to hire: try not to.
A lot of people treat choosing their cofounder with even less importance than they put on hiring. Don't do this.
The idea should come first, the startup should come second.
You need this sort of a tailwind to make a startup successful.