Sian Collins:
The student has all his own professional gear.
Never take this at face value. I rarely see a student with pro gear, ( I've actually never seen it ).
Always think really carefully about if you really need two togs.
Apart from the boys getting ready there isn't much to miss and it's common for them to get in the way of otherwise great shots, like you walking down the aisle. Last thing we want in the wedding photos is the AF assist light from a student at the back of the church cutting through the ambience.
If you have two video guys as well it then becomes more of a circus and it takes attention away from the bride and groom as most people don't like being photographed or filmed and your guests will be on the lookout constantly. Possibly on edge and unable to fully relax.
These are just observations from a few of last years weddings. You could lose more than you gain.

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Wedding Photographers - Wedding Photography