I forgot to take a "before" photo, so this one is "during." You can see an untrimmed section toward the back. The trees you see to the left of the hedge (outside the fence) are hazelnut trees that have not been cut down to hedge size.
It only takes an hour or so and I don't need to use a ladder. As you can see from the photo, I also don't pay too much attention to neatness. This year I ended up with a lopsided hedge. I don't really care, so long as it's trimmed back. Next step: picking up and disposing of all the trimmings.