That When i used to second shoot with ben I usually did the groom and groomsmen shots while ben was off doing bridal prep -during the ceremony he'd focus on B&G and i'd position myself to get the mother of the bride shedding a tear etc - then while he was doing B&G walk i'd circulate round and do other couples. During the speeches he'd focus on the speech giver and i'd get B&G reaction , and so forth. I also had to be prepared to switch hit - ie to cover anything he missed, or on one occasion to shoot the whole ceremony solo because his car broke down on the way from the brides house. More than anything the second shooter needs to be competent, calm, and unflappable... they may not have that much experience of weddings (itis afterall how many of us start out) but they need to know their camera backwards and be capable of getting great shots without having their hand held Itis emphatically not a case of standing behind the first shooter like an uncle bob and getting the same shots from a different (and less flattering) angle