* It's difficult: It's hard to cut the back of your own head, and even getting the sides even is challenging.
* It's time-consuming: Cutting your own hair takes longer than going to a barber.
* It's not always the best result: You may not have the same skill level as a professional, and your hair might not look as good as if it were cut by a barber.
However, there are some barbers who do cut their own hair. They may have developed techniques to manage it, or they may simply prefer to do it themselves.
Ultimately, whether or not a barber cuts their own hair is a personal decision.