Church wedding is treated as a very serious event where two individuals are going to say their vows before God and man. This is a lifetime commitment and every distractions should be minimised. I have taken countless time in Church wedding, and the last thing one do is to put oneself in the spotlight where the congregation, groom and bride and the officiating ministers get distracted by the "antics" of the cameraman (eg. standing next to the pastor to take close-up, unnecessary movement across the sanctuary, causing distraction such that the ceremony is disrupted). Basically the church takes a very serious view when regarding Holy Matrimony.
So these are some of my experiences
a. Ask for the program so that you will know when to take and how to position. Key events to watch out,
i. father of bride covering her face with the veil. this make take place just outside the sanctuary or in a special room where whe rest.
ii. walking down the aisle (usually flash is allowed at this point until both groom and bride are in front of the altar, this is where ZERO flash begins - but still you need to ask). If flash is not permitted, station yourself at the end of the aisle and shoot from there, as the bride and the father walks down toward the sanctuary
iii. father giving away the bride (this is where the Officiating Minister will say "Who give this woman away to this man?", the father will in turn raises his arm
iv. the taking of vows, where the bride and groom exchange their vows (bride is still covered by the veil)
v. the exchange of rings, you are going to be at a distance
vi. the unveiling, frontal shot is most vital
vii. the pronoucement of man and wife which will result in a kiss by the groom, sometimes the more modes will plant a kiss on the cheek. You have to asked the bride and groom what it is going to be. Tell them to do it slowly for it can happen very fast
viii. signing of the marriange cert. Bride, groom and witnesses (usually the fathers)
ix. special items presented by friends while they sign
x. walking down the aisle
Normally, due to restricted movement, I have to engage another friend to help, where strategically I will place myself on the left or right of the alter (where the pastor will stand) with a tripod (long lens 200 mm), a friend of mine will be located to cover the frontal shots (unveiling, exchange of rings, kissing), you need to have even longer lens (depending on the sanctuary). To ensure that the moment will be captured in posterity, the backup plan is to get the bride and groom to go through the motion of getting married when the official one is over. That is when the service is over. This will have to be told to the couple first, as the duration between these "re-do) and to be present in the refreshment hall is rather short.
Depending on the couple, some bride arrive half an hour before the event, and will be hidden in a room where she can rest. This is a good oppportunity to take those impromptu shots, just be mindful that usually this type of room serves as a Sunday School rooms where it can be very cluttered.
Hope these tips help.
Regards
TC