The thing is, hairdressing in general is nowhere near as lucrative as it used to be.
I remember years ago, you couldn't get an appointment for love nor money on a Friday and Saturday for example, unless you booked well in advance.
Every hairdressers on the high street (and there were loads) used to be buzzing, especially during those times.
But since most of over the over 60s no longer go for a shampoo and set, and people in general rarely just go for a blow-dry, mainly due to the popularity of hair straighteners, the salons have very much lost their 'bread and butter' clients, who brought in a steady income.
Add to that the fact many people expect mobile hairdressers to be cheaper, due to having less overheads and you'll be missing out on the school haircuts trade, and you might find yourself on far less than minimum wage when you look at your monthly income.
As long as you bear that in mind and it's not going to break the bank while you try to build up a steady client base, it might be ok.
Sorry to sound gloomy and good luck 