Give yourself enough time
Often, when a new entrepreneur has a brilliant idea and decides to run with it, they feel the need to go full speed ahead, get a business license, start involving programmers, taking out loans and talking about their ideas as if it were a done deal.
However, this is the road to a quick burn out: too much thinking, too much talking, too much boasting; not enough careful planning and small, incremental doing. It takes years to gain credibility, especially for those who don’t come from a business background.
Not only that, it takes rejection after rejection. Sarah Blakely famously started her business with a pair of control-top pantyhose with the feet cut out and it was only after months and months of cold-calling and visiting hosiery factories before one of them agreed to make the product. 
She kept her job for two years before finally quitting her day job (this was soon after Oprah named Spanx as one of her “Favorite Things”). True success comes in small victories, spread out over unreliable lengths of time.