Practice, get as much range time as possible, with and without the laser. It'll take a while to get used to. Don't wait for a stress situation to find out. I have a Bodyguard .38, not exactly what you've got but close. It took some time to find the right grip and trigger pull, to start putting together decent groups.
Never argue with an idiot in public. People passing by won't know which one of you is the idiot.