Point 9 ("Realize that there's an ebb and flow") is definitely something to remember. Even when I'm really motivated on a project, the motivation never seems to last for longer than weeks. I guess knowing that this happens to every body, and thus knowing to simply ride out the troughs (so to speak) is the best way forward.

A quote I like which sums this point up is: "People often say that motivation doesn't last. Well, neither does bathing - that's why we recommended it daily."