Well I guess that planning & practice are the secret ingredients for a successful moonshot.
I did neither - in fact I hadn't planned to get up for it (I got "persuaded"). As others may have reported, the light levels got so low that achieving any sort of reliable focus was a lottery. In retrospect, maybe I should have tried to focus on the stars as I think they were brighter.
Plus the small amount of "play" between my 300mm, TC14 and D300 that doesn't normally affect daytime shots became apparent when shooting exposures of 2-10 seconds.
There: excuses over: