I once took a pottery class and loved best throwing the clay against a wall to release the air bubbles. Then, with wet hands, I held the clay between my fingers while my legs rotated the pottery wheel round and round to create - another vase. Or another ashtray. When bowls fail, they become vases or ashtrays. When they almost succeeded, they were vases.
Writing is like making pottery.
A good teacher helps immeasurably. Final editing is like applying glazes and proper heating and cooling. If something goes wrong during any step along the way - failure. Writing also exhausts the brain, sucking its gray matter and red blood dry of all energy. Teaching and grading writing causes so many problems that many teachers avoid doing one or the other, or both, or worst still, fake it.