To use this filter or not? First wedding shots!

Im pretty nervous to shoot my first wedding, but determined to make this a sucess..

I have a circular polarizer for my 70-200mm 2.8 IS Lens and was wondering if this would be a good idea to use for out-door ceremony shots?

Indoor is a no-no as it would not be bright enough..

Thanks in advance!

I could only help some of your shot. Just make sure your at the correct angle with the sun.