I have owned dogs for 53 years and trained my own dogs since I was around 9 or 10. I don't have a PhD in behavior, but I took 2 years of animal behavior in high school and 2 in college. I spent an additional 8 or 9 years researching, studying for 10 - 12 + hours a day, rather obsessively, some seminars and help from mentors...the science of behavior and current behaviorists' methods and ideas etc, etc. It's a passion of mine and so I have really put a lot of time into it. I tend to do things that way when I get passionate about them. Ask my kids when I was practicing the piano for a wedding. I drove them nuts, practicing one complicated line over and over again for hours. I didn't want to blow it and I spent 12 hours
at least a day getting it down pat...lots of new music. I pulled it off, but wrecked my wrists doing it...bad tendinitis. I have also, up until recently when I moved, trained professionally as a behavior specialist/consultant. It's how I made my living. I have worked heavily with dogs that have "aggression" issues...of various types along with other kinds of problems that owners call me for besides regular obedience training. Although I have taken some agility with my Doberman, that is something I would not be equipped to teach. I don't know enough about it.
At any rate, this is not a competition. There are so many people, even here on Chaz who have lots of ideas that never occurred to me, who have more experience with difficult dogs than I. There is ALWAYS something more to learn and experience, no matter how much someone already has done. And I certainly haven't done close to what a lot of people have. Those are generally the people I go to for information and advice. The more I learn, the more I realize how little I know.