I have to agree with the previous folks who posted. It's a gamble and only you can decide if it's doable and worth the risk.
FWIW, I was a dealer for a few years, between 2011 and 2017. Before that I restored vintage turntables and tube gear, until broken trash gear became worth $$$. I crunched the numbers and realized that I couldn't make the numbers work if I had to pay retail rent so I did only in-home demos. I was located in the greater L.A. area and looked for great gear to sell that wasn't carried of over represented in the area. I did reasonably well but I gave up every weekend and some evenings and at the end of the day I did better than break even but what I made didn't really compensate me for my time. I enjoyed what I was doing and loved (most) of my clients, but it's a hard way to make a living these days. I can't speak for the Nashville area but in L.A. most of the successful dealers have either (1) been in business a long time and sell gear that everyone wants (which means you shouldn't try to compete), or (2) have outside sources of income like a trust fund or rich wives. That wasn't me nor you either, I'm guessing.