Well done 2dart and Dubaidave! - The first few are hard and then . . . you start getting picky on both visuals and sound. Fine tuning your own performance until it squeaks. Anticipation is the key and the more you study human nature the easier you'll be able to anticipate. I've had operators who couldn't anticipate thunder after a lightening flash.
Most events, especially weddings have a structure and will become very familiar as you do more. The quicker you can anticipate, the more iconic shots you'll have in the bag.
Good on you both for diving in the deep end though and you obviously care enough by your physical and mental preparations.
I have filmed hundreds of weddings and events and still get a great buzz from watching them unfold - the day it becomes just a job, is the day I pack it in.
Keep on practising - it will get better thanks to your initiation.