The most common mistake entrepreneurs make when launching something new is trying to do too much at once. I call it the hammer-and-nail syndrome. Let’s say I give you one hammer and one nail. Your job is to hold the hammer in one hand and the nail in the other. All you have to do is drive that nail into a piece of wood. That’s it; just nail that one product or service. You may miss the first time or even the second, but eventually you’ll nail it. But what if I......