Yes, it is always a great idea to start at least 9 months before your actual party. This way you have time to make changes. Start by making a list of all the stuff that will have to get booked. Such as the reception, Mass (if you’re having one), DJ, food and many more. After that make another list of all the party supplies that you will need according to your theme. By making lists and checking them off as you go along the way, you will be organized and get things done on time.