Hiring people is probably the toughest job of any business. Finding employees which value your business, your idea and your aim is really tough. I should know, because I've tried hiring WordPress developers. There are a ton out there, but the hardest part is finding those who want to develop their skills further, have clean code, have great attention to detail and value your idea. It takes a lot of time and when you find that you've ended up wasting time it can be very frustrating.
Employees make the business, they can either help it become big or let it all go down the drain. As shown in the video below, startups such as Airbnb and Instagram carried out very rigorous interviewing procedures to get the best they can.