Knowledge: To become a doctor, it takes about 15 years while a professional hairdresser requires only 6 months.

Conversation:
I have brown hair.
Neat, are you from an area that brown hair is common in like Central Europe or the US?
The US, most of my family has brown hair too but they vary for some reason.
Brown does vary, it can be almost black or be a light brown.
That makes sense why people in the family all have some shade, I was thinking of dying my hair but I don't know who or where to go.
A professional like a hairdresser can hair color and hair coloring can be done independently as well.
Using a hairdresser is probably the best option. I would be afraid to do it on my own.
The thing about hairdressers is that a majority are licensed professionally.
Oh that's good! Do you know how long it takes to become one?

Response: Oh yeah, to become a professional hairdresser requires only 6 months.