ok
i have short dark hair. i have booked to have a half head of higlights BUT i don't really know what that means 
basically i am bored and want a bit of a change but i don't speak hairdresser 
i am going in for a consultation next week but don't want to appear an even more ignorant arse than i already have done.
so
what is it that i want and how do i explain it please??