The job duties of a self-defense instructor focus on teaching self-defense skills to students. Your responsibilities depend on the style of self-defense that you teach. As an instructor, you typically train students to defend themselves using martial arts techniques. During a class or session, you explain and demonstrate the techniques and then guide students as they practice these new skills until they can use them effectively. Self-defense instructors work in martial arts studios, schools, community education centers, and other facilities.