I myself was self-taught, but I had professional training in Chinese chess when I was young, two hours a day, everyday. I self-taught myself Go. I understand what is important for beginners, how to train, and how to think. I understand when I just need to persist, what I should not spend too much efforts on right now. I know which books to read, and which books to avoid. I know what software I should use. I know how to choose tournaments and sections. I know where is my potential, and how to reach there. I know how to refuel my confidence.
For a little kid, where can he get or feel these tips by himself? He is just not mature enough.