you can "teach" yourself anything. but thats like the saying "a man who is his own lawyer has a fool for a client".
no offense, but that's like a child who raised himself. or a guy who reads first aid books instead of going to a doctor. it only makes *some* sense when you have no teachers around, but the world is very small, and if you really want to learn something you travel to a teacher. if your not willing to do that, you really dont want to learn.