Become involved in discussions and decisions in the planning stage with the groom, acting as a sounding board for his ideas. Even if you think the ideas are stupid you need to remain positive and supportive at all times.
Help the groom choose the ushers. These are usually picked from both the bride and groom's families and friends. It is advisable to pick someone who regularly attends the cinema. Make sure the ushers are aware of their responsibilities. The egg will be on your face if Grandma is not seated well in advance you know.
Together with the groom, decide on the outfits for both yourselves, and the ushers. Make sure the usher’s outfits are one size too small just to frustrate them.
Note: if the outfits are hired the cost is usually the responsibility of the groom, however this is often negotiable.
Attend fittings of outfits. Always be polite to the ladies undressing you and invite them into the cubicles.
Attend the rehearsal. This is crucial. Be prompt. Never talk over the priest or marriage celebrant. Only a fool would do such a thing.
BEST MAN SPEECH
Prepare your speech. See NZSTAG Best Man's Speech Tips for help and ideas. There's some solid speech material you can download to get you started.
Check car-parking facilities and access, particularly if there will be disabled guests. This will score you extra brownie points with the bridesmaids. Nice.
If the bride is unable to collect outfits then this duty is also yours. Be sure to check that the outfits are complete and that you do not pick up outfits for the 80’s party you are attending the week after by mistake. Can you imagine what people would say if you showed up as Boy George?
Find out where the groom's and your butt holes, sorry buttonholes will be on the wedding day.