There has to be room for creativity within your product or website. Designers hate having all their ideas shut down. That’s what you’re paying for, after all. If you have a strong vision of what you want your site or product to look like, it’s going to be very tough to work with you. Do everyone a favor and keep an open mind about the project and what you want it to look like. Being too specific really turns designers off.
Keep in mind you’ve hired a professional and they’ve had much experience making great websites. A designer’s best work is delivered when he has some breathing space. Although sometimes it may look like they don’t know what they’re doing, trust your designer.
This is something I really wish I knew how to explain to clients without alienating them or making them feel stupid. Maybe I need to give them a link to this article.