Your Grandma was smart to not co-sign with you. You are not in a position to pursue this. I couldn’t tell if you just want your private certificate or to change careers, but it doesn’t matter. You can’t afford either right now.
Now, with that said, you can do it eventually. Start by getting a new job. Realize that if you’re making $25 an hour as an FA, that’s really the equivalent of $9 an hour when you factor in the down time. Factor in the commute, and it’s about $5 an hour. So get a local job paying $20 an hour and you’d be way ahead. You have to take a long view on this. It’s not “I have to do this in 3 years or else all hope is lost”. It’s “I want to do this in 6 years (a more realistic number for you), how to I get from here to there?”
Also, this is literally the worst way to expedite moving out, so not really a good plan for that. Getting a local job that pays about the same as you FA job (even slightly less) is the best way to expedite moving out.