It’s both easier and harder than you think.
Write. Just… write. Write without worrying who you will offend (Mom, Dad, God… Wait, are they all the same person?). Write without thinking about what you haven’t read, what you can’t do, where you haven’t been. (All Arthurian epics. Pretend to care about Arthurian epics. The Lake District or all the places in England where epic Arthurians are set.) Write without worrying your worldview will be criticized because it is wrong. (“But… you haven’t memorized Tolkien. How will you know how to write elves?”) Write without censoring yourself, because your worldview is snarky. Writing without using the tools others have used, because your own hands work best. (Scrivener? Who really has time to figure that out…?) Write without setting yourself outside your own work, without subjecting it to the critical, limiting, acidic gaze of Other. Write without holding yourself more accountable than anyone else.
Place your feet on the sill and jump. Believe that the air is the same for you as it is for everyone else; that is, that you have just as much chance of falling or flying as anyone else.
Let go and rise.
Close your eyes and look.
You will not fall.