The steps you will need to take in order to become a diving instructor can vary significantly depending on where you live. Certification will be necessary in just about all regions of the world, but the certifying bodies and the specific steps needed to get certified can vary. Before you can become a diving instructor, you will very likely need to earn a SCUBA certification. SCUBA stands for self-contained underwater breathing apparatus, and you will need to learn how to use this apparatus by taking part in a training course and spending many hours practicing SCUBA techniques.
SCUBA training courses are available throughout the world, and the courses usually involve both in-class training and in-the-water training. Expect to spend many hours on this training; it can take several weeks, months, or even years in some cases. Once you finish such training, you will usually be required to spend a certain amount of hours underwater in a diving setting before you can become a diving instructor. It is best to look into the requirements outlined by the governing body in your area so you can figure out exactly what is expected of you.
Once you have met the prerequisite requirements, you will need to enroll in a training program that will prepare you to become a diving instructor. This training can be quite intensive, so be prepared to dedicate a significant amount of time, money, and effort to the program. You may end up spending time first in a classroom, then in a pool, then in open water. Each phase of the training will be guided by a certified instructor who can ensure you are learning all the proper techniques. As your training progresses, you will be required to develop teaching presentations on your own and run through them either with the instructor or with the instructor and classmates.
At the end of your training, you will be required to take a knowledge and skills exam in order to become a diving instructor. You must pass this exam in order to become an instructor, and if you fail, you may be required to re-take the training program or wait a certain amount of time before re-taking the exam. It is likely that you will need to undergo a practical assessment as well; during this assessment, you must demonstrate proficiency in various diving procedures and techniques.