Yeah, I fully agree with LahLahSr, event shooting is quite exhausting! Especially weddings since the pictures they want from you have to have good (excelent) quality, every second could happen something you could miss, which you really have to catch.
I really wont be shooting a wedding myself, because it's so hard, and if you fail... Your memorycard could get down, your camera could get down, you could just miss that moment, you could use wrong settings that result in motion blur or whatever...
Be aware though, people on events always want on the picture with their friend(s). ''Ah common, could you -the photographer- take a picture?''
And then you hear many clapping the hands and you realise you missed an important moment.
Be prepared and look if you can find another amature-photographer who could help you, then you dont have to worry that much if he/she can shoot those friends and you could be the whole day by the bride and groom.
Panasonic DMC-FZ18, Panasonic DMC-FZ28, Canon G5, Canon 350D, Canon 50D + BG-E2N
Tamron 17-50 2.8, Canon EF 70-200mm f/4L USM,
Canon 18-55 II plus lots of Minolta MD/M42 lenses and bodies