One even tone down the whole run
The tell of a professionally stained Overland Park fence is that you can't see where the crew started or stopped — one continuous tone corner to corner. That comes from washing and brightening the run to a common baseline, then spray-and-back-brushing at a steady rate so no section goes heavier than the next. On the long perimeters common here, evenness is the whole game, and it's the thing a rushed one-person crew can't fake.