I did not realise that hair stylists in California needed to take 1500 hours of classes to get a hair stylist license. And that shampoo-ing hair in Texas required 150 hours of classes
"Texas, for instance, requires hair-salon "shampoo specialists" to take 150 hours of classes, 100 of them on the "theory and practice" of shampooing, before they can sit for a licensing exam. That consists of a written test and a 45-minute demonstration of skills such as draping the client with a clean cape and evenly distributing conditioner."