Being an individual is as easy as being yourself. Don’t let the rules of any subculture or counterculture sway you do do anything you don’t want to do. Wear what you want, and do what you want. If you waste time and energy being the way others want you to be you never get to be yourself. Don’t listen to others if they call you a poser, either. Chances are, they are the real posers.
The bottom line is if you want pink hair but your friend thinks that’s too trendy they are probably jealous they didn’t think of it first. Be sensitive, and explain this to them. When they see it your way, offer to help them dye their hair pink. When it’s done you can laugh at them and call them trendy. Then dye your own hair green.