What aspect of writing do you find most challenging?
Discipline. Not only in avoiding distractions and focusing on my work. But also controlling my tendency to pour too many excited ideas into a novel or story. When I give in to that temptation, it can become a jumble. And my pre-readers (fifty of them) tell me! Editing down to a level where the ideas are still rich, but fade into the background of an exciting adventure? That’s the hardest thing, and it requires real work.