Good luck Mike!
The previous advice about having a back-up for everything should be taken seriously. I had two flashes give up on a job once ... luckily "Mr. Backup" had a small third flash stashed away that saved the occasion.
Just a useful tip I picked up:
When photographing a wedding group (assuming you're doing some 'formal' shots), get everyone together first, take the whole group and then remove the folks not needed for the next shots. This is much easier than trying to add people to the 'bride and groom' duo when the guests are scattered all over and involved in other distractions.
It's hard work but can be good fun ... I'm sure you'll have a great time!
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