I agree, B&W saves trash or changes mood (so it only works well in very specific shots). Also always think about what your shooting for (if its going to be black and white, light it correctly for that conversion and it will make it that much better and less time in post making it look right.)
Viewing on a calibrated equipment here and they are almost all under exposed. No big deal to fix, but it should be fixed before delivery. Its a wedding and white is supposed to be WHITE.
You say not much photoshop skills? Get some fast if your going to be doing this stuff. Also get a copy of Adobe Lightroom, it will make proofing and editing 1000X faster.