I don't mean to clutter up your informative thread with cheering - but WOW! Thanks to kiwidude, theducks, and user_none for pointing me to Sigil. I'm making progress and enjoying it, even though the learning curve is challenging for me.
The progress on things I was stuck on has been great and I'm really glad I knuckled down with this.
I think there will be a lot of css tutorials for refreshers in my future.