The first step should be to manufacture the design. Learn what it needs for its design, including the determination of any furniture that is able to meet the needs of homeowners for your room. Consider also the final appearance of the entire design space.
It is better you use the services of an interior designer because there are times when a designer also will consult with the design architect or engineer to ensure that the concept is safe and functional. Changes in decor and design of personal space vary widely, it could simply change the appearance of the room through the wall paint color changes, the addition of carpet, wallpaper, adding accessories to beautify. But for a more drastic change, it is possible to change the structure of the building (renovation), change shape and size of the furniture and electrical lighting installations as well, depending on how drastic the changes you want in your bedroom.