The first time you build something from scratch, it's an experiment. You might be experienced enough that you have a good idea of how it's going to turn out, or you might not. Still, you're rarely ever 100 percent certain about the result.
As long as you know that, though, chances are excellent that you learn from what you've created. You do something one way, then see how you could refine it in the future to better suit your vision. If you have the chance to do it again in the future, you iterate and improve on those processes. It's an inherent part of the act of creation.
