If you have an unusual feature to your nose, such as tip cartilages that are more prominent than average, you must demand that the plastic surgeon you are interviewing show you before and after pictures of his patients with similar features.  If you don't see the pictures, you have no idea whether he can accomplish the changes you want for yourself.

FacialSurgery.com has a page containing my slightly cynical but completely accurate advice on finding a competent plastic surgeon.