At last some clear sky and I've marked out a point where my pier is going to go. It's situated for next door's shed to block out an annoying street light, another neighbours tree blocks out some bedroom windows. That leaves me with a good view of Polaris for setting up, a gap between the trees in the east, a fairly clear south and west above my rooftop, plus everything up above. I may need to put a screen up on one fence panel to block out the neighbour's security light. Sorted 🙂
Now I need to start digging the hole and getting the stud cut to size.