As a therapist, I can teach a couple how to communicate in an hour. It's not complicated. But dealing with the troublemakers who started the fight? Well, that takes a lifetime.
A wedding photographer must be both assertive and engaging in order to take the images you want without irritating you or your guests. This requires experience, professionalism and the right personality.
It's easy to make everyone feel included! If you have close friends and family that can't attend, consider a reception once you return home. There are hi-tech options for the actual ceremony too, like video cams so guests can watch the wedding live. Or, go the social route and create a #hashtag for your wedding so family and friends can follow along.
Fans of your marriage will always be on the side of your relationship. They won't pick a side -- they won't side with you or your partner, they won't split the two of you up.