A designer should be hired early in the project process—essentially once a decision has been made to pursue a project. You should hire an interior designer—just as you would hire a lawyer or call your accountant—when you need an expert. Interior designers have met rigorous educational standards and also have a great deal of expertise in project management. In addition, designers are affiliated with one or more professional associations that require continuing education. Interior designers are able to execute a project properly, efficiently, and with respect for the budget. An interior designer is well versed in scale vs. proportion and color theory as well as neuroaesthetics.