I agree with much of what has been said. A fresh pair of ears and all that. However as always the final say would be down to me. I know what I want and it is my money after all. My tip would be to use someone you know who will do a good job. It may take a bit more STUDIO time which will obviously cost more money but it will be worth it.
A notice in the studio I use reads " Excellence comes as standard. Perfection costs extra."