Use Student Demonstrators. You are an instructor, not necessarily a master technician. You do not have to demonstrate every technique yourself. If you are weak in a technique, find a student who is strong in the technique and let them demonstrate it to the other students.
Stay on Track. Once you have the attention of a class, do not lose it. Stay focused on the subject. Sometimes it is easy to get off the subject while instructing. A small deviation is okay, such as telling of an experience, but get back on track quickly. Once you lose the attention of a class it is difficult to regain it and you use up valuable time doing so.
Use Assistants. Every instructor has blind spots, so use assistants to help monitor the class. Assistants may also help by pointing out things missing in your curriculum. Actively question assistant for their opinions, since their volunteering options may be awkward or seem disrespectful. Use guest instructors occasionally. Often another instructor may say the one thing differently enough for a concept to become clear to a struggling student.
Only one instructor should be in control of a class. Assistants should only assist, never interfere. Do not tolerate conflicting or coincidental instruction. If students receive differing information at the same time, it confuses them.
Guest Instruct. If you are a guest instructor or teaching a seminar, ask the regular instructor if there are any specific topics he or she would like you to address. Caution the students that you are merely giving them a different perspective on Taekwondo and that, if anything you say conflicts with what their instructor has said, the student should obey their instructors teachings.