Just because you know how to brush your teeth does not mean you do not need to see a dentist. That same idea applies to the many reasons for hiring a designer.
A designer looks at your wish list objectively to provide answers that satisfy form, function and budget. You are then able to avoid the downfall and problems encountered by those who take the DIY route.
You cannot afford not to hire a professional who can maximize your property value while saving you invaluable time, money and needless aggravation.
But, not every designer is the same...