First: Patience is key in all things design and especially in Photoshop.
Second: Be in touch with your purpose. It can only guide you.
Third: Quality comes eventually.
Of course I learned specific Photoshop skills, but in a much broader scope, I learned about myself as a designer and what my creative process usually looks like. Design is such a tricky balance of patience and achievement. You have to make progress to even want to continue, even if that means finding out what a certain button does and if/how it can be applied to your work. Photoshop also becomes strangely addictive when you've learned enough. I felt the need to need and strong desire to keep going. I suppose that's the whole point, though.
It's been fun, Photoshop.