I'm going through the same thing over the last 2 weeks. I have a Speed Graphic with 135mm lens. My suggestion is to go back and forth between the books and the camera. You have to know the camera before what the books say make sense, and you have to know what the book says to make the camera work.
I ruined my very first LF negative by pulling out the dark slide before closing the lens aperture preview thingy. You have to make mistakes to learn, and I'll never do that again!
The best advice was to remember that this is a hobbie and it's supposed to be fun. Enjoy the process, even (or maybe especially) the process of learning.