In my experience, no entrepreneur is fully prepared for the journey they are embarking upon when they start a new business endeavor. You simply can't have everything you need before you begin this journey. Being an entrepreneur is about being resourceful, or as Paul Graham puts it, being "relentl...
Define the point where you can take a breather. Map the route between this here now and that there then. If you can count the steps along the way with confidence, that's good. If you know how you might change direction midway through or even turn back, that's good. If you can decide in advance ...