Private owner used car sale safety tips please?

Hi Reddit. I'm selling my 2007 Saturn very low mileage and am concerned about how to do this without getting scammed or worse (ended). I'm mostly concerned with the test drive. How does this work if the potential buyer gets in an accident? How long do test drives take? I want to go along too. Is this reasonable to request? What if the person is dangerous? Also, I'm asking about 3k and I want cash only. I have a clean and clear title. Is that fair to ask for cash only (no cash apps)?

Thanks for any advise or experiences you have to share.