You really want to know your cofounders for a while, ideally years.
... you want to be proud of how much you can get done with a small numbers of employees.
Remember that you are more likely to die because you execute badly than get crushed by a competitor.
Share results (financial and key metrics) with the company every month.
Every first time founder waits too long, everyone hopes that an employee will turn around. But the right answer is to fire fast.
You should be able to describe any employee as an animal at what they do.