Before getting to your type, you need to invest some time to understand the structure and logic of the system, which is complex but accessible to anyone.
For this step, a good teacher who masters the system and has used it for himself is far better than a book.
Then, you need to type yourself. As this system is based on inner motivations, you are the best person to do it, but it can be a difficult process to do on your own. Three
options are offered to you :
1- you can do a test (online, takes 1 hour) : it will give you 1 or 2 types to reflect on and choose from.
2 - you can go through a typing interview (with a teacher, 1 to 2 hours)
3 - you can follow a course covering the 9 types in depth. Usually, when you listen to your type description, you can't not recognise yourself.
In any case, once you know your type, you need to study it thoroughly in order to be able to use this knowledge for your inner growth. Again, a teacher who has mastered the
Enneagram for him/herself is far better than a book. My experience is that this knowledge becomes "alive" in you, when it is transmitted orally to you, through a "live" experience.