There are a few common mistakes that often prevent entrepreneurs from reaching their potential, Stephen Key writes. It will be harder to build a successful business if you don't listen to other people, are too involved in the day-to-day operations of your company or have a hard time completing tasks, he writes. "As entrepreneurs, we all make mistakes," he writes. "... But over the years I've learned that the more humble and receptive you are, the more likely you'll succeed."