Super Stylin'

It's quite easy. The repeat twist section is easier than D10, where you're doomed if you misread it, because there's no chance of misreading here. There are sections where it's obvious they tried to make it a S11, and usually, expanding it like that makes it harder than a single, but it doesn't even feel harder than a single. Separately, it's a very satisfying and fun pattern, so if you want to get into D12, I highly recommend trying this before moving on.