Your wedding day is a day that doesn't get a do over.  This is why choosing an experienced photographer that you can trust is numero uno! Choose them wisely.  I don't just say this as a wedding photographer but as a former bride that wasn't given this important piece of advice and learned it the hard way.  Invest in your documentation over almost everything else.  It is after all, the only thing you will have remaining to pass down for many legacies after you.  All of the planning, the details you spent endless hours to perfect.  It's all preserved in the still photographs & motion picture you invest in. Your love for one another AND the photographs is what will last when the day is done. Document it well.