I've had wonderful experiences with many of the escort services and independent providers in Los Angeles.
The best way I've found to avoid a scam or a not great provider, if that's what you're ultimately discussing, is to use TER - The Escort Review.
And, I agree, it is better when you can get to know them even just a bit, it adds to the whole GFE.
My only suggestions would be to to establish the rates and expectations ahead of time. That and respect THEIR time, don't dilly-dally, pick, talk, agree, pay, say 'thanks' and continue with your day.
Finding long hair providers is a wonderful thing.
- LoveItLong