In the front...I only try to cut the split hair...maybe you can have someone dust the back for you. How concerned are you about having the back even? How do you wear your hair? My back was and for the most part still is hard to see the ends...so when I dust, I just clip very little. I can't see, but I mainly wear my hair in twists and braids so it's all good.
Also bumping for more responses.