We must spend many hours with the Book and develop a good working knowledge of it. Some want to be teachers, but don't know the truth. Some show great diligence, but convert people to their same falsehoods. We must gain the experience. If you want to know how to do personal work, go with someone who does know how.
Personal work builds teachers.
In trying to teach others, you will automatically grow. As you go out and work, you will need to study as never before. People will ask questions and make arguments that will cause you to study. We need to become skilled teachers. We should seek to know what and how to answer everyone.