Stick with one hairdresser. The one that always gets it right in the end.
At first you think they've ruined your life by cutting your fringe too short and all sorts of messy, but it grows a little and you love it a lot. Then the next hairdresser comes along, cuts it that bit too blunt, leaves it that bit too long, and you're that bit more devastated.
Poo you hairdressers.
Why can't you just read my thoughts and know exactly what I'm after?