When a person goes through normal or typical schooling, that is, going to a public or private school or being home schooled, they can be considered educated. People are normally considered more educated when they complete a higher level of learning, such as going to a college or university.
Many people will consider a person "educated" if they are above average in intelligence, but this is still very subjective.
Individuals could be considered educated in their craft if they have shown they know how to do the craft and do it well. A person who is educated in sewing will have shown that first, she can sew, and second, she can sew well.