Moe did have teachers to some degree. I believe there are stories of Moe getting help from a pro when he was Young. He also was known to ask for advice when he was not playing well when he was younger. Most likely he learned from Paul Bertholy and who knows maybe Sam Snead's advice had an effect on him. He also gave credit to Manual de la Torre later on in life. So he was not completely self taught. I don't think that anyone is completely self taught as everyone is influenced by someone while learning golf.