Other forms: autodidacts
An autodidact is someone who has learned things on their own, outside of school. If you've learned Greek and Latin, as well as landscape painting and auto repair, without any formal training, you are quite the autodidact.
Auto- means "self," and didact comes from the Greek word for "teach," so an autodidact is a person who's self-taught. Being the autodidact that you are, instead of calling the plumber when your pipes burst, you bought some manuals and began to learn how to fix it yourself. You might want to learn scuba diving next, now that your apartment is flooded.