Call each dealer, ask 4 quick questions, tap in your answers. When you're done, one button turns it all into a message you send back. That's it.
You are just a normal person asking about a used car for sale. That is the whole story.
If anything gets confusing or they ask something not on this sheet: say "Okay, thank you, I'll call back," hang up, and text back what happened. Don't try to answer it yourself.