The prerequisite for executing something, is the idea that you have an idea. Otherwise you will never go through the hassle of making something in the first place :)
Before you write something it feels like you already know what you’re going to write. Still, writing is though and it takes a long time before you come to a result that says what you figured you want to say all along.
That is, because what actually happens, is that you work hard on converting this network of vague assumptions in your head, which already feels meaningful, into something which can actually be meaningful to others.