Be a good listener.
This habit puts shot in your locker. It gives you the psychology of the “case” and puts your feet firmly on the bed-rock by permitting you to apply the basis measure — “Put yourself in his place.”
Know you are right in your facts and arguments. If your arguments are based on hearsay or “hot air” you will not be convincing. Unless you have gathered the facts yourself the chances are you may be lying about your own goods!
Argument vs. Facts
You may think your opinion is argument. It is not, nor is it convincing unless insinuatingly sup ported by facts gleaned from your own experience or that of known authorities of repute. — H. B. Joy