I had my barber tell me what guards he used and the style before he retired but then I forgot it.

Next time I get a really good haircut I'm just going to take a picture of it. The barbers in my area are pretty cool though so I enjoy the conversation usually.

The added bonus is that they talk to a lot of people so they know who is selling their dirtbike, boomsticks, or who is looking for work and who has a company and is looking to hire. The "networking" opportunities are a great bonus, especially if the people looking to hire/work/sell/etc are there in person getting their haircut or waiting in line.