To be truthful, I had an awful Photoshop trainer. He did small beyond routine what we were expected to complete in the textbook. I ended going at one point. I had discovered how not to teach, and after four years I was teaching Photoshop. What a good instructor can perform is give you tasks you never imagined you could do (and enjoy!) More significantly, a good teacher can give you private guidance when you do not even understand you made a mistake, or there is a typo in the textbook, or you accidentally missed something, and something goes wrong.
Finally, a good teacher will give you tasks to do that give you actual-world scenarios and specifications. This makes you for creating real money with Photoshop.