The first & most obvious reason to hire a professional is for the sake of time and convenience. If you try to fit an entire flooring project into your already busy schedule, who knows when it will finally be complete and how long your home will be disrupted for? Professional expertise means that the project is more likely to be completed according to schedule, and that you will end up with professional quality results. Especially if you have no experience, installing your own flooring opens up the potential for mistakes, which you might end up needing a professional to fix anyway. Get the job done right the first time by hiring a contractor with proven experience.