Also... Something I don't think I mentioned, but maybe noteworthy. As I cover, I always start at the farthest point rear, on the bottom.
This is because as #1, as covering is layered, if you start from the rear, all overlaps from that point should be overlapping to the rear. This lessens any lifting/delamination from wind/air/oil/etc.. as all seams will be going to the rear.
Same for starting on the bottom. The bottom will wrap to the "up" side, after that everything wraps down.. so If you start on the bottom, all seams will wrap downward, and thereby leaving seams virtually undetectable, especially as you look down on the plane.