Although rules differ from State to State people who study and become cosmetologists are trained professionals who have to meet stringent requirements to work on your hair.
The following are the general rules that apply to most cosmetology courses with an attached website for your reference:
Nebraska State Board of Cosmetology License Requirements
This is a quote from the site:
Every state has different cosmetology license requirements, and even different beauty licenses available as options. (For example, Illinois now has a hair braiding license, but not every state has adopted this new specialty certification yet.)
Beauty Schools Directory keeps in frequent contact with the regulatory boards in each state to offer the most thorough and up-to-date information possible about beauty licensing laws, including the number of cosmetology hours required in each state.
The national average for required hours to get a cosmetologist’s license and barber’s license is between 1500 and 2100 hours, but it varies from state to state. Some states offer a hair license that is a slightly shorter program than cosmetology, and may not include nails or makeup. Nail technology licenses and makeup artist certifications typically require between 300 and 600 hours. Esthetician license requirements varies wildly from state-to-state, with as few as 300 hours in some states up to 1500 hours in others. Electrology/electrolysis and laser hair removal typically requires around 500 training hours.