I would be too worried about messing it up for the couple, I know I would have been upset had ours not come out.
But that's thinking negative Sue,
Don't mess up and take 3 shots of everything you take, There's a good chance one of them will be good.
The weddings I did wanted 25 prints in their wedding album,
I took about 12Gb of shots, I had loads to choose from, Bin the rubbish then let them view the rest on your PC... then choose what they want and bingo..
Off to Jessops or any Pro printing Lab to get them printed, Carefully arrange them in the album and collect your £500. Thanks very much sir.:nuts:
TBH I have seen plenty of Pro's making a total arse of shooting weddings and they make a living from it..
Hardware needed.
Camera bodies. You will have 3 very soon.
Plenty of compact flash storage, I'm sure you have too.
Something in the region of a 16-35mm/24-70mm lens, Not sure on that score what you have.
And last but not least plenty of confidence..
Plenty to think about there..