I cut my own hair recently in like-minded style. I asked swmbo, "is this okay?"
Her: ".... yes"
Me: "Well is it or isn't it?"
Her: "It's up at the back on one side, but no one will notice."
Me: "You noticed."
Her: "Well... your friends might notice."
Biting my lip I asked her if she wouldn't mind using the clippers to straighten it up. I felt the clippers attacking the part of the back of my neck that she had said was lower than the other part... strim strim strim... then I felt her move back to the part that she'd already said was too high and start strimming there!
Suffice it to say the hair on the back of my neck is now a good half inch higher than it usually is. I'm off to John's of Congleton next time.