Some time ago you asked a question about intentions for the new year. My reply was: "I am going to learn Javascript". I am now at step 3 in your ladder (HOW to use it).
I am studying code from some open source project and planning to contribute; indeed these projects are mostly of awesome complexity!
My 5-cents is: Writing real code that proves to be useful to someone else should be the indicator that level 3 is reached, but that's harder than what it may seem at the begin of the process

A nice day to all of you,
Marco