Hi Charley!
I know what you mean, in my job (I’m also a realtor), I deal with strangers every day. I wrote something about this in WSSA’s blog some weeks ago, and ‘m sure it will be very helpful for you:
Fluent Speech In The Workplace
I also speak about this quite frequently in my coaching sessions. I encourage you to watch the videos. You can filter them by tags (search for “presentations”).
If you need anything else, please do let me know!