Heartily agree that it would be great to hear from an actual 911 operator about specifics..

I just finished making a non-emergency call to my local PD (about a vehicle parked illegally) and I made sure that I had the license plate and description of the vehicle written down. In my first statement I gave my name and address -location is everything! I was surprised that I was asked for my telephone number - surely that was displayed on the other end. Maybe a double check?

It is certainly harder when you are stressed and more so if you aren't certain of your location, and for that matter, what is the best format in which to give your coordinates, assuming you have them?