After a good night's sleep, I finished up the 2D game example. It mostly makes sense, though it's going to take a while to remember a) what the important elements are, and b) where they live in the UI. Cutting-and-pasting signal handlers does _not_ preserve the association with the original event/element so (for example) if you create signal handlers in the wrong script file, you can't just move the code without going back to the object and correcting the association to the signal handler in its new location. Minor annoyance initially but not a problem going forward - that's been the worst part of this example. The tutorial is generally pretty good but there's just so much UI, so many properties, the tutorial can't possibly be completely step-by-step. At least it's not video so there's an outline I can read and I can search for what I need help with.
Very simply, it's going to take practice to get familiar with the UI. No avoiding that.