There is no room for ego in most important areas, IMO. Firearms handling is an important area, IMO.
Learn what you can, where you can. Then, evaluate the information based on correctness, applicability, and usefulness.
I've heard a few guys who would seem, at first glance, to be highly qualified to give advice offer up some terrible suggestions. I've also seen great instruction from people who don't have the most experience in their area. The difference was that the good instructors knew their own limits and the limit of their knowledge. They sought out confirmation from people who had the experience to judge their ideas, or made it clear that their ideas were untested. The other guy just boasted, and straight made up things to reinforce the impression that he knew what he was talking about.