About the artist block thingy, a relatively good explanation on one of the reason how it happens
Also, regarding 5. Avoid “How-to-draw …” tutorials, this one is kinda debatable, certain things you wont be able to pick up from just books alone. For example a stylize hair drawing. It will be hard to learn by observing from life because some artist does it so uniquely. I personally thinks its ok to use these so long as you can benefit from it.
Of course theres the whole "understanding" part that you will need to do along side with it as mention so that you wont be drawing from memory.
Other then that great list! I would add one more though. "Ego" as that was my mistake >3>