One thing that made a huge difference for me: record yourself when talking to strangers and listen to it afterwards. Unbelievable how much insight I got and awareness of my own clumsiness/mistakes once I listened to myself talking. The way I do it is I carry a small digital recorder under my shirt and just press record before I start talking.
When deciding to do this, you should take into account that it may be illegal, depending on whether you're in a public space and what state you're in.
This is the bimonthly 'What are you working On?' thread. Previous threads are here. So here's the question:
What are you working on?
Here are some guidelines: