Answer : It really depends on what you mean by "professional." There are designers that handle your complete project from start to finish and who might also install the furnishings for you. Other designers just specialize in different areas- for example, a designer may focus on just flooring or carpets.
There are many resources available online to find a reputable design professional in your area. A simple search engine search should provide links to directories of interior decorators and other home professionals whose expertise might be valuable to you.