This might be a ridiculous thing to worry about but I definitely do over think things.
I have been at the same hairdressers for about 3 years now. I was with one woman who went on maternity leave after about 8 months and I was moved over to one of her colleagues who I have been with ever since. There is another hairdresser who works there who does some amazing colour work. I recently saw a photo of some hair she has done and would love for that colour too. I have an appointment in 2 weeks with my regular woman, but would I be unreasonable to move it to be with the other lady? I could always ask my current hairdresser to do but the other woman is definitely more advanced.
I'd be interested to hear what other people would do!