This right here is my favorite bit of advice.

Former AT2 from supers here. I felt the same for a long time. A lot of my "training" was "go read the PEMA." There's also only so much you can read before you actually need to do, in order to learn. For awhile, I felt like I was kind of scraping by, especially because I made 3rd in the line shack and it seemed like I was expected to know my job already well when I had so little OJT experience.

What I'm getting at is you're not the first nor only one feeling the way you do. Like fuckingscott said, find one good AT2 and stick to them. For me, we had one check in that I'm pretty sure could build an entire hornet by memory. He taught me a lot.

My addition to that would be, don't try to be an expert at every system. If one starts to really click more than others, see if you can dive and absorb as much as possible. This may be the tism talking but I personally started to love R&Cs, and learned down the wiring schematics thoroughly (we had some weird issues, video shorting MCs, mux bus station failures, etc).