In my opinion, design is a practice not a curriculum. Great design comes out of a willingness to produce many poor designs and a few good ones; learn from them; and move on.
There's no such thing as a "design in my head". If it's not "on paper", it isn't a design.
There's no such thing as a "design in my head". If it's not "on paper", it isn't a design.
Good luck.