What basic knowledge and skills are required to become a Vipassana teacher?

What would you say are the basic requirements to become a Vipassana teacher? I don't necessarily refer to attainments. More to basic knowledge and skills. What I can think of would be for instance: - knowledge of the 5 precepts; - knowledge of the 4 noble truths; - knowledge of the 8-fold path; - be able to listen. (Just to name a few.)