Do you hold to own a credentials to work lawfully as a interior decorator? Can you work as a decorator for hire without a certfication or...

Can you work as a decorator for hire without a certfication or amount?
Need and Architect - how do i know?...
Answers:    No, but they do get you through the door quicker. You will want a business licence though.
I want to go back over my room....
You might want to check with your own state law. I live in Virginia and I don't reflect on there are any requirements here bar the business lisence, which is easy to get hold of. Your main concern will be recomendations. Try free work for friends first to build up a reputation.