Remember to keep the 911 short and to the point. "I need cops and an ambulance" and give the address, then hang up. Remember, they have a probably have a script to get information and they're recording. It's the same thing as talking to a cop, IANAL but I'm guessing anything you say on a 911 call is admissible in court.
Excellent advice. I hadn't considered that the 911 recording could be used against you.