You have spent many months ( or years ) planning your special day, and you have booked all the various people to assist you on your big day. They are all professionals and their business is to make sure you have the day you have always dreamed of. I am there to bring all these services together on the day so that it runs seamlessly with no hiccups or problems. You could rely on the best man to perform this task, but he has probably been asked as the best friend of the groom, not for his organisational abilities. He may be willing but will YOU get what YOU want.