I think the most difficult part of plotting isn’t coming up with ideas. There are always plenty of things that can happen.
What I’m finding really hard is getting my plot to make sense. That doesn’t just mean avoiding errors in logic, like plot holes. It means aligning my plot with my character arc and the emotional journey of my story. I need to make sure that my plot is making both my characters and readers feel. When my characters reach their emotional climaxes, I want my plot to climax too.