Just finished adapting Stephen King's short story The Reaper's Image. I am in awe of even King's early work. His book On Writing is one of the best on the craft.
Here's my two cents about writing: I know writers who labor to perfect a particular project. You run into them three years later and they are still at the draft, or worse, the concept stage. The odds of "perfecting" any one piece of writing is are very small. We learn and grow by doing.