Hairdressers are usually private entrepreneurs and there is usually only one hairdresser (or not more than 2) in one place. Usually you have to book a time to a hairdresser some days or even a week in advance. Hairdressers´ are usually open from Monday to Friday 9:00-17:00 and on Saturdays 9:00-13:00.
The general rule: 'parturi' does basic haircuts for both men and women, whereas 'kampaamo' ja 'kampaaja' usually specialize in more complicated hairdos. However, exceptions do exist.