Overdress everytime and always take far too much equipment.    Smile and the world smiles with you, fart and they all walk away.     Prepare well in advance for something to go wrong a fix it first.     No matter how busy you are, make time for some fun.     Their wedding is the most important in the word to them.     Its their special day not yours so work hard so they can play hard.  Your only as good as your last record.   If you need any help or advice just ask me, no charge, just ask ; )