Gear! here's a tricky one... Take all you have or don't... Carry on restrictions, the absurdity of being gate checked and, in turn, arriving at the other end with a torn sack of tangled camera metal is not very enjoyable... You need to pick and choose what gear you take and, with time, that will get easier! You take a couple of lenses, your creativity and ability is tested and that's great - right? If you're a full time professional wedding photographer, you find ways around this kind of dilemma (Insurance, hardcases, knowledge) ..if you're just starting out and you have no choice, well, you do the best you can. You'll stuff it up a few times, you'll wreck yourself carrying a massive stack of gear around only to arrive home a day later and laugh as you realise you used two lenses and one body - but what is it they say? Better to have and to not want than to want and get slapped by a bride that looks wide when you shoot her at 28mm because you forgot your *insert lens here* ...that's the saying, right? Anyway... This will sort itself given a few goes!
Would a gear list be helpful? probably not... Well, Canon 5Dmk3, mk2, 16-35, 35, 24-70, 50, 85, 100, 70-200... 580 and 430 flash units, triggers, lots of batteries... more batteries... all the cf cards, some sd cards, too! OH and a Sony RX1, I shot a lot of the bride, Kate, getting ready with the RX1. (Fixed 35mm stunning little underrated beast)