There's only one way to learn. 8 months ago when I got the One (my first android phone) I hadn't flashed a custom ROM on a device since my Treo 650. With a few hours of reading and some of the really useful tools others have put together you can quickly grasp the basics. Now I'm starting to figure out how to do things by hand.
The bottom line is, this stuff isn't rocket science and if you're willing to put in some time, you can figure it out.
Also, ask questions! You've got some people right here who can assist or point you to the right info.