As long as you want to do it, it's not difficult! If you are interested in educational institutions, you can also apply for enrollment representatives or educational assistants of educational institutions first. If you have the conditions, you can take part in various courses of the organization, take notes by yourself, study hard, and learn more about the lecture style and ideas. Practice in front of the mirror at home. When you have prepared all these yourself, you can try to apply for a lecturer from the organization leader.