Your wedding should be perfect, just the way you planned it. You want to look your best and take advantage of all the beautiful locations you chose.
You want to be guided into just the right light, all the right places, have your dress arranged properly, and awkward hands changed to look relaxed. You want balanced compositions with variety, contrast, unity and appropriate proportions. There should be a sense of fun and enjoyment without feeling hassled. With priorities other than a photo shoot, you simply want to get on with the day knowing everything is taken care of.
You want the reassurance of experience, someone trained and practiced in your event, who can guide you every step of the way.