Practice your pacing and timing of your processional
Your processional is the walk down the aisle, generally it begins with the Officiant followed by the groom and his parents, the mother of the bride and her escort, your bridal party and finally the bride and her escort.
Sure, you'll select the right music, the right order of people and all that great stuff; but let's talk about pacing and timing.
You want to allow for spacing between each person walking down the aisle, this space allows for a clean photograph and a grand entrance for each person. Also practice your pacing, you want to walk down the aisle at a nice lea surly pace...you don't want to run and you don't want to go too slow.
So at your rehearsal if there is not a coordinator on hand to release each couple for the processional pick a landmark, a tree a column whatever may be available as a marker for when each couple will begin to walk down the aisle, for example, "when the couple in front of you reaches "that column" (usually half way down the aisle) then the next couple will begin their walk down the aisle.
So, whether your keeping it traditional and striding down the aisle in a formal manor or if you've made the bold choice to buggy down the aisle, be sure to talk about pacing and timing for your processional.
Or - make it easy and hire me to help with your rehearsal :-)