I don't agree with the idea that a gun will suddenly cause more problems than it solves but I do think anyone who carries should know how to use it. Gunsite offered a dangerous game course and I doubt a lot of people went to it let alone knew about it. Anyone carrying should test themselves to find out just how fast and accurate they really are instead of shooting for group once every couple of years.
10-4 on get some preparation. That really big Grizzly isn't going to hesitate in his charge, cut you any slack per your lack of preparation. BTW even the general rifle course at Gunsite is good preparation for any potentially lethal encounter (far better than none at all.)