Be prepared for anything. 
Most girls who come through will be somewhere in the middle of the road as far as being enthusiastic, talkative, etc. However, there are always a few exceptions.
~Some girls may want to talk your ear off and never let you get a word in edge-wise.
~Others are extremely quiet, either because they're shy, nervous, or they just don't want to be there.
~There is also the rare exception of a girl who may ask a very very unexpected, inappropriate question that will make you feel uncomfortable or upset. Last year, a girl I was rushing asked a sister and I,
"Do you guys worship the devil?" 
We handled it well by responding with, "All of our rituals are based on Christian principles". We still don't know whether she was asking it because she was afraid, or because she was hoping that we do. LOL.
~No matter how tired you are by the end of the night, don't let it show. If you still at least pretend to have energy, that energy will rub off on the girls you're rushing.
~Try as hard as possible to remember the name(s) of the girls you meet and something they're wearing or what they look like to help you put a name with the face later on. You could even do word association in your head such as, "
Patti has a
pink shirt."