recording piano and solo vocal in a "classical" environment

I'm going to be recording in a church on Sunday afternoon. Not for a service, but for a CD two of my friends have been working on.  They prefer to track together, one piano and one vocalist.  It's not capturing a live performance or anything, so what I was thinking of doing was trying to isolate everything as well as I can.  I have two inputs on my interface and two large condenser mics.  

Should I isolate as much as possible using chairs/blankets behind the mics? Set up the mics in such a way that they're facing away from one another and facing away from the opposite source?  That would let the vocalist make better eye contact with the pianist anyway.  Or should I just capture everything the two mics would normally capture?  

I don't plan to do much processing (if any) to the recording beyond basic limiting that allows me to bring the sound level up and prevent just a couple peaks from going above 0.0.   It's meant to sound as "live" as possible, but I think what I want to do is keep the audio from bleeding too much.  Any advice is welcome.  

Ah, good point.  One of the mics has only a cardoid pattern but the other has a figure-8 switch that I need to make sure stays off.  It's also got a -10dB pad and a low-end rolloff switch.  Since it's a female vocalist, I think I'm going to try the rolloff since that should help exclude the bass of the piano even more.  Got a pop filter for the vocal mic already, so we should be good to go.  

It's going to be fun.  A mother-daughter pair - well actually, mother-daughter-daughter trio, but only one daughter is singing at a time.  No duets that I know of.  An immensely talented family and a great-sounding room with a huge ceiling.  This won't need any processing beyond getting the levels up, assuming I do my job well.  I'll put a track or two up in the Songs forum early next week.

thanks bit. We may need to give it a couple different tries.  That may work out the best.