This is your wedding day, so really you can do whatever you want. That being said, here are a few things that can make the photography side of things a lot more rewarding for you:
First off, you might need a time frame of how long portrait sessions take. Here is a rough estimate of how long it takes to comfortably get really great pictures of each grouping. Please consider the following timeline when preparing your day. Add even more time if travel between locations is involved.