The only danger with self teaching that one has to be aware of and mindful of is a lack of opposition. If there is no one there to challenge you when you develop ideas then wrong ideas that you believe will be as "right" to you as actual right ideas. You'll never be forced to validate them, thus never be forced to correct them. Often until it's much too late.
RE: There is no alternative to education if you want to manage life in a beautiful and orderly manner