Tomorrow is my cousins wedding and I have been asked to take as many pictures as possible. They already have a pro photog so there is no pressure at all. My question is, I have an SB-800 flash and I'm expecting some pretty low light especially during the reception.. As a general rule, would I get better results using the flash off camera held at arms distance bounced of the ceiling as a supplement to my built-in flash? Or should I mount it to the hotshoe and use it as my main flash which would most likely be bounced from the ceiling unless direct is needed.. Thanks in advance..