Answer : To become a home decorator, interior designer is required.
A few resources that can help somebody to become a home decorator are the websites for National Home Chandlers Organization and American Society of Interior Designers. These sites show information on becoming certified in that profession and provide details about salary as well as career opportunities. For various related careers dealing with design and art, you might like to explore Professor Stephen Bayley's work at Central Saint Martins with his video interviews on creatives for BBC Four website. One may also want to enjoy teaching by Sir Christopher Frayling, President of Courtauld Institute of Art, UCL Art Museum Director or Professor David Jerman whose subjects include contemporary art & fashion design history on Youtube.