If your a guest and asked to be the main photographer forget it, my son asked me the exact same thing and it just doesn't work. You can't be taking pictures-arranging the principles and later on all the guests and take the photos at the same time.
If you not an invited guest then the problem doesn't occur.
- Im doing a wedding in sept. I have told them (as they are friends as well) that i will be covering the day as the photographer so please dont include me as a guest / in seating plans / in transport plans etc etc. They intially raised an eyebrow but after i explained to them that my 'job on the day' as requested by them, is to be the photographer then i should really remain external to the wedding party and be treated as a non guest.
They understood this entirely and also, i believe, cemented in their minds that i am treating this with professionalism, care and responsibilty. Which is what you would expect from any wedding photographer who cares about what they do and what they are delivering in terms of service. This also frees me up and allows me to 'work' without thinking about having a drink with the groom, or spending time with their family in conversations etc. It sounds a little cold but having tried being both on the same day I have learnt a valuable lesson.
communication in key with the friends / client / familt and will, in the long run, help you to produce a more polished service.
I have only shot 4 weddings, all for friends. All, bar one, i treated as a non guest. The one time i realxed this rule was the one wedding i learnt the hardest lessons......dont relax the guest / non guest rule!!
Im sure there are many pros / amateurs alike on here who have vast experience and can also give advice, but i hope my little, non pro starting out in wedding photography advise helps.
dont forget to post the images as well (if you can ) for critique. It may be harsh, blunt, prasing etc but i have learnt a lot from this forum. Take the advice constructively and it will certainly improve your photography skills.
All the best