Another thing to add that I've encountered
Please do not pick up your brass...or even adjust or touch any evidence...
Try to maintain the scene's integrity as best as you can until law enforcement arrives
I've not sat thru a CCW class, however I've run into a couple situations where there were justified, lawful shootings, and the shooters seemed very surprised that the weapon will be taken by LE for processing.
I'm not a huge fan of the "do not talk to police" mantra, but at the same time, I dont want someone who is completely justified getting locked up because they worded something wrong
By all means, BRIEFLY explain what happened, who you are etc etc but you do not have to go into great detail with responding officers. A shooting will require an investigator respond (at least in larger jurisdictions) at which time you can explain to the investigator that you are willing to fully cooperate, but you would like your attorney present at all times.
Please have an attorney in mind at all times, so that if the time comes, you dont have to ask around for recommendations, call 21093 different firms finding an avail. lawyer