Hi David,
Welcome aboard!
I'm glad to have you here and I hope we'll be able to fulfill your expectations. From my experience with PixInsight users, the learning curve seems much more steep than it actually is. The first steps are difficult because our user interface paradigm is quite different from what is customary in most imaging applications, but once you get acquainted with it, everything speeds up.
Yes, Harry's video tutorials are really nice; he's doing a great contribution with them, which I appreciate a lot. Stay tuned since after the release of version 1.5.2 (ASAP), I'll engage myself into producing a new series of videos, which will cover from the practical usage of the interface to the most advanced tools. We're just at the beginning of this project!