What city are you in? Generally, I don't bother talking to people on the phone, I tell them to make a mutually confirmed appointment at a camera monitored **PUBLIC LOCATION*** as per the CL tips on how not to get a 9MM shoved in your face.
I have sold some stuff on CL and have gotten creeped out many times. Trust your instincts , "some guy " LOL . Can you post the ad? This is kinda juicy.