We have educators who are professionals at what they do, so that we don't have to be. That's the purpose of the technical division of labour. The professional mechanic is a better mechanic than I, even though I can take care of some basic stuff myself. The professional electrician is a better electrician than myself, even though I know quite a bit about electromagentism and even circuit construction, and can take care of many small things myself. And my [future] kids will be better taught by teachers who are professionals at educating; even though I will be able to help them out with many things at home, I can never be a substitute for that professional.