Nex camera for a wedding?

Hi Nex-fellows:

I sold my Nikon DSLR gear two months ago after I bought a Nex5n and a couple of manual lenses as I decided to take it easy (less weight and less serious looking). I, however, have been asked to shoot a friend's wedding. I felt unable to do it and explained to her: I can not really do it now as I am using manual lenses and no flash!. The response was : Tim, use whatever camera you have, I trust you...

I could not reject as we have been friends for a long time. I will be the backup cameraman, though. Have you used Nex and manual lenses in a wedding? any flash solution for 5n? any imput will be highly preciated. Cheers.
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Tim