Andy and Al - welcome to ECN!
Andy, I know that the principles of the forces behind our job can be very confusing (even with a college degree, and several years of "hands on" OTJ experience I was lost in parts of Elec Theory). There are a lot of sources out there (including here) where you can find helpful folks who will take the time to explain the whys as well as the hows.
And remember, although the author of any one book will often disagree, there is often a simpler explanation in another reference book... and, just as we are all individuals, and interpret things differently, there is no "one true" explanation or method that will work for all.
Stick with it, and I hope you'll find it a rewarding career.
Good luck!
