I have done my fair share of wedding photography with a Canon EF system, digital and film.
I usually bring an assistant if I know it's going to be big. Carry spares and back-ups of EVERYTHING. Be seasoned, know how to pose people. It really is for pros. You're going to get bridezillas and people no matter how well you pose them and how dead-nuts accurate the exposure is, they will haul you off to court.
One lens you will want, and they do date back to the FL mount, is the 85mm f1.4, if you can spring for a newer rig, 85 f1.2L. IF you are shooting an EOS system these are readily available from any lens rental site.