The gift is great idea. I've shot a modest number of weddings for friends and children of friends. ---
Don't carry too much gear. Two, at most three bodies. I no longer shoot any MF. Just two M-series film Leicas, one colour, one mono. XP2 Super is your friend in mono.
On the bodies I have 35 and 75. I change to 21 or 50 only if I HAVE to.---
Make a shot list and agree it with the couple. They say they want reportage but they'll also expect a few 'standard' shots, including the big wedding group. Start with the bride and groom and add in bunches from there until it's an 'all in' shot.
---- Get it commercially processed and proofed to 10x15cm/4x6 inch. Weed out the complete failures; give 'em the rest, and tell 'em that reprints are their responsibility.
We used to routinely overexpose color negative one stop, and with the processing, have double prints made, buy proof albums, which become potential parent albums when the order sheets are torn out -- having an order sheet by each print is very convenient. I used to combine a couple of albums which I bought by the dozen.
I would often sell a basic package, and if I did a job they liked, they would quite often bump up several levels, and the "previews" -- never call them proofs, if they wanted -- would be sold to become parents' albums.
I have done the formals both ways, I prefer to spend 20-30 minutes in the church for some traditional and non traditional portraits-- candles, but don't set the bride on fire, some veils will burn. I have not carried a candelabra in years, but it is around somewhere, keep a lighter to relight the candles which the altar boy may have put out.
After you nail down the must have shots, you might get creative with the B&G in a park, or I have shot some with sunsets and the lake. I once slapped on a blue filter for a silhouette with the lake in the background-- one way to make the water and sky blue-- don't forget to take it off. ;-)
There are a lot of tricks-- I use them sparingly, but the home made spot filter-- I make the opening oval and open the diaphragm a bit larger than the opening, plus double the exposure. I use clear finger nail polish on an old UV filter, mark the right f stop on the filter box to remind you, scratch a notch to tell you the top-- and don't forget to take the filter off.
A friend had a much larger front filter size, and he used Scotch tape, leaving the center open. Commercial center spot filters make a circular opening and it is almost always too large.
I used to carry a handkerchief, you may need one, and folded up and put under the front of my Rollei or lens to tilt it up on the floor, was good for one shot from the aisle during the service.
I have a list of photos I have evolved that I use to go over with the B&G, but let them know I will do my best to get everything, but as in the case where they requested a balcony shot at a church --without a balcony-- I cannot guarantee everything, besides I keep the list. You develop a sequence of working, and of course you look for a signature shot unique to your setting.
I have not done double exposures for a long time, used to do a portrait of the B&G and expose some stained glass over it.
Sorry-- real old school stuff, some dated ideas. If you get a couple of extra creative shots and the rest look good, you are doing well.
I sometimes grab a shot of the Groom and Best man waiting in the wings, or even outside, and once the altar boy rode up on his bike, so I shot the Groom riding up to the church on a bike, top hat and all, saw it in the window of the studio a few weeks later.
Bit of a long post, sorry about that.
Regards, John