Here is one of my top criteria for choosing a wedding professional, as promised..... I will update every couple days with a new tip!
Organization: Everyone has their own definition of organization, mine may differ from yours, that being said, it is important for your wedding professionals and you to be on the same page. They should be able to pull up a file that has all your information on it and be able to talk to you about your event without getting it confused with others. Feel free to ask your wedding professionals how many events they will commit themselves to in a day, for a cake designer or florist having more than one, or even multiple is pretty normal; for a venue ( unless its gargantuan in size) its not. Also you shouldn't have to continuously remind your wedding professional about details that you have already talked about, nor should you have to wait a week before getting a response on an email or phone call.