STUDY will not help. You need actual practice. Try to find a pro to work as a second shooter. At least do one wedding with the pro. Got off that horse and do it for free/cheap at least once just to get it done.
What he said ...weddings are "different"...fast paced, hard, lots of work, etc...it needs to be experienced a few times
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What he said
http://sartinphoto.com
Nikon Stuff (not that it really matters)