I take some halfway decent photos and have been asked by a family friend to photograph her daughter's christening. I have a Canon EOE350D camera, a 50mm f/1.8 lens and a 18-55mm f/5.6 kit lens, but no flash other than the one that's built-in to the camera. I've also got a tripod and a remote release cable.

I don't want to let my friend down; nor do I want to spend the afternoon taking photos only to have a mere handful that are actually of any use.

Given my limited equipment, are there any tips and/or tricks that I can use to make sure that I give myself the best chance possible for getting some good photos on the day?