
First, Take a look in the mirror. Know your hair. Curly or straight, short or long enough, the texture of your hair, bushy or easily manageable,have an abundance of hair or are you starting to thin etc.
Then, Check out your facial features. Do you have a square jaw, a round jaw or a protruding nose? All of these things are important as your hair style will frame your face.
Decide what statement you are trying make. Cool, hip, carefree, party guy is a bit different from a business man who is a captain of industry.
Search the ideal haircut from internet, TVs and magazines. Be sure to see if those people you like have similar facial features and hair characteristics as yours.
Communicate with your hairdresser or barber. They're not mind readers, you have to tell them what you want. And don't be afraid to speak up, it's their job.