I am amongst those who "started early," but, unlike most folks, haven't had a single lesson in my life. My start in horses was rough, with my parents buying too many horses, too fast, and not understanding the costs associated. A lot of heartbreak and struggle followed my brief stint as a horse owner for about 5 years, from founder to severe arthritis, to euthanasia of my "heart horse."
In the time since I have had to sell my own horses, I have trained many horses, strictly through my own personal learned experiences, and have been successful. I have learned a lot of humility working as a small-time independent horse person, experiencing the multitude of personalities out there (both human and horse).
It took me a long time and an insane amount of reading and learning to get where I am now, and I by no means consider myself a professional or anything of the like. I do what I can to help others through my own personal experiences, and I am always pursuing more knowledge and experience.
Tangential biography aside, if I could give you any advice, I would say learn to practice a lot of patience and humility. You will never agree with everyone, and not everyone will agree with you - the trick is to remain humble and patient when learning and sharing your experiences with others.
Welcome to the horse world; you are stuck with us for life, whether you like it or not