Ask A Question (#5): What part of the writing process do you find most difficult?

Katelyn L. asked, “What part of the writing process do you find most difficult? For example, world building, character developments, editing, etc.”

Each aspect of writing has its challenges for me, and they crop up unexpectedly. I might be as familiar with a given character as I am with my own family, and one day just suddenly struggle to get through a scene with her. Or I might just be ripping along at a good pace and then suddenly hit a huge plot hole I never saw coming and sit there for fou...