This is really good feedback. Thanks for letting us know.
I really really like the blues courses but I know what you mean. Once he gets to the "inspired by" section he really has to kick it up a notch to successfully mimic the Kings. It was rough on my fingers, and I have been playing for a long time.
So I think you should move on. We never intend for you to spend weeks and weeks on a section.
I would like to get some more info. Was it the fingering that was getting you stuck, or was the things he was saying about chords and scales?