This question is dependent on your life goals. If you are looking to make money, then yes. But if meaning and purpose is what you seek, then no.
You don't need to be a mechanic if you don't know how. You won't become rich from it. It will not make you famous. It is unlikely that you will be made famous.
You would need to spend years learning how to do everything properly. This would mean that you would have to pay someone else for your car's repair. It's the reason most people don't bother. They find something better to do instead.
You can make a lot of money if you are looking to do well. But if you want to live a meaningful life, stay away from the mechanic's industry.