What Set Designers do...
Some of the things that a set designer would do are discussing with script writers, formulating ideas and creating sets and designs to portray the act/performance/script, working with team members, drawing drafts and layouts, making/buying props.
Most of the time, they are freelancers if they aren't in the midst of a production. They can work up to 60-80 hours a week, including weekends and evenings. They work as a team because productions can be big, and some designers may specialize in certain areas of set designing and backstage work. Together they bring life to the production and script with props and designs.
Education and Skills of a Set Designer
Set Designers aren't actually required to have a college/university education, but they usually take a course design-related, such as Fine Arts, Theatre Production and Design, Film Production, etc. School isn't the only place where set designers develop their creativity, they work and learn about design and their own creativity.
They tend to be creative, organized, detailed people that work well with people and communicate with others very well. They should be able to focus on their work and know how to prioritize the work on their hands.
Annually, full-time set designers can earn from $20 000 to $70 000. But many set designers are freelancers. Their pay depends on the amount of jobs they receive and work on and how much the production pays them.