In general, some previous work-related skills, knowledge, or experience may be helpful in these occupations, but usually is not needed.  For example, a drywall installer might benefit from experience installing drywall, but an inexperienced person could still learn to be an installer with little difficulty.

These occupations usually require a high school diploma and may require some vocational training or job-related course work.  In some cases, an associate's or bachelor's degree could be needed.  Employees in these occupations need anywhere from a few months to one year of working with experienced employees.