17 with a permit but no one of practice driving with Do i buy car or begin draining my pockets with driving school what would you do!

I recently moved to a new state and I don’t really have anyone who can help me practice. I live with my grandma, but she doesn’t have a license, and I don’t have other family nearby (seriously) I know the basics of driving, but I definitely need more confidence behind the wheel and definitely more experience. Driving schools near me are way too expensive one quoted me around $700 for 12 hours I’m wondering if it’s smarter to spend that money on driving lessons which would need to be some what consistent to even have a lasting affect on me , or save up toward getting my own car and using the car to practice more consistently once I can. I don’t want to spend all my money on lessons and still not have enough experience afterward to pass my road test.
What would you do in my situation?

TL;DR Get a car to practice driving more consistently for overall cheaper or begin draining my pockets to get somewhat consistent driving with a driving school