How much to tip?

Getting hair done in a few weeks. It’s very expensive. Extensions, color and cut. Total comes to about $750 before tax (I know, it’s a lot but I get my hair done once ~every three years aside from extension maintenance every 8 weeks which is not expensive).

My hair girl works out of her home, has no employees, sets her own hours. I had to wait two months for this appointment. I’ve been seeing her for 5 years.

What would you say is the right amount to tip in this instance?

Part of me wants to think that someone who is self employed and has little to no overhead, should set their prices accordingly and not expect tips but I grew up in the service industry and the thought of not tipping feels absurd.

Thoughts?