Help me build the How To Think Sideways Surprise

I’m putting together the How To Think Sideways Surprise—the extra course material that everyone gets when they join the new version of How to Think Sideways (Legacy students and grads will upgrade automatically and for free—but you can still help build the Surprise).

I want to make sure the Surprise is spectacular.

To make it great, I need to know this:

What part of writing do you find most difficult?

Anyone—even folks who aren’t considering joining the course, can comment here.

I’ll let you know what the HTTS Surprise is going to be in a week or two.