Be ready to keep trying and keep reformulating. Even though master Yoda says there is no try, only do, it's going to feel like a lot of trying for a while unless you are extremely lucky and/or skilled. If you are not coming at this already from having the full skill set and the full finances and the full social relations that are just going to guarantee your success no matter what. If you come from any background where you have to struggle to make things happen mainly due to financing, then be ready to just keep hanging in there and keep feeling your dream and just trusting that you have a good product.