I am glad to see that you realize this as "something of great importance", as it truly is, but what concerns me is that you are putting this couples most cherished wedding memories at great risk. Don't do it! The job of a wedding photographer should not be taken lightly. It takes a tremendous amount of experience and knowledge to be able to deliver a quality job. Unlike portrait or engagement photography, you do not get the chance to redo it if the images do not come out...there is only one opportunity to get these images right and it takes a tremendous amount of knowledge and coordination on the photographers part to make it happen. It is my opinion that no one should ever take on a wedding job until they have been a second shooter at a few weddings to gain experience and become familiar with the flow of the day as well as any issues that may arise. If you are looking to break into the industry you should consider joining one of the wedding photography forums. I know the DWF has a mentoring forum where you can learn from your peers. I really do hope that you reconsider or at least tell the couple your concerns and perhaps offer to shoot the wedding for free to gain experience, that is, if they are willing. Good luck!

Doing wildlife? Give a wild animal a way to flee. If it's fidgeting, making warning or distress calls, or mock charges means it's nervous. Line the horizon too. (That's a common mistake and will make a good photograph look really bad.) Try two hours after sunrise and two hours before the sun sets. That will get you very good lighting. Taking pictures of fireworks? Put yourself to the wind it'll make it so that when the bursts start moving they'll go across your picture. And the smoke will move out of the camera's sight more quickly. When doing something very close up (on the flower setting) you want to focus it just right on the thing you want to see good because everything else will be so much softer.

Without seeing any photos, the best advice I can give, is to learn everything you can about photography and the camera your using.

do you have flickr? that would help with the tip- giving