You joke, but it's true. In general you shouldn't hire people until the company is already successful, i.e. people want what you're building faster than you can build it. If you do, you introduce a whole lot of other problems (having to pay them, having to convince them to pivot when you realize you're not succeeding, having to communicate the new company vision to them, having to keep them from getting disenchanted and bringing morale down) that you wouldn't have to deal with if you just didn't hire them in the first place.

I've found the biggest cause of failure of software projects (in general, not just startups) is staffing up too quickly. You really want to know what you're doing and have some idea how you'll get there before you bring other people on board.