A whole lot of legwork/networking and my penchant for annoying a whole lot of people, honestly. Pretty sure my recruiters (yes, had to work with a couple) hated me and continue to stab voodoo dolls of me, even in their retirement. But, it got me to where I wanted to be.
I wish I could offer better advice, but it really was just a whole lot of luck, my own hustle to find info, and getting in touch with the right people at the right time. I had the same luck with my AFOQT/TBAS scheduling, too. Judging from a lot of folks I've talked to recently and posts on here, a lot of the openings (FC1, AFOQT/TBAS, etc.) to be able to do a lot of that stuff have been closed. Pipelines are jamming up with pilots, so the chance to just shuffle people in for that stuff seems to be greatly diminished.
So, my apologies for not being able to provide specific details, but it really was a lot of hustling on my part, networking, and chance that isn't an exact roadmap that will work for others. The main thing I can advise is to do a lot of your own work getting boxes checked, if you really want this. It's easy to get frustrated and die on the vine if you're always waiting for someone else to tell you what to do next, waiting to hear back from someone, or waiting for someone else to schedule something for you.
Research the hell out of everything you need to do, network and ask questions, and handle as much of it as you can by yourself. It'll pay off two-fold; first by proving that you're serious by taking the initiative and second by getting the networking wheels moving.
No one cares about you getting this job as much as you, so do what you can to prove you want it to those that you encounter in your path to wings.
Good luck!