Everyone has his own learning style, which varies from person to person. You just need to find a way that suits you. On this issue, you can only ask yourself, others can't give advice.

For example, if you can teach yourself, why did you sign up for the training class? So, can you teach yourself? Who knows? Just yourself. No one can guarantee you, even if you train, no one can guarantee you. What kind of results you will get depends on your vision and what kind of training you choose.