Great list and advice. A couple things I'd add:
10. As a mashup of points 3 and 6, Start Talking to Yourself. Pretend you are on stage at a conference giving a talk, and just talk. Then write that stuff down. You'll find the stuff that you write down from your talk sounds a lot more like you really sound. And you start finding some of the things you are thinking about don't hold water when you say them outloud. Or the opposite, things are much clearer when you are hearing them come out of your mouth.
11. You should be nervous hitting the publish button. It's like releasing software. If you aren't a little nervous about how this post will be received or criticized or you aren't a little nervous you just pushed some boundaries, you might not have tried hard enough. It's similar to point 7. You're creating something new here. If you aren't nervous, if you aren't a little uncomfortable, you probably are just regurgitating someone else's lessons. Making something new usually involves putting something very sensitive about yourself out there for people to crap on or love. :)