Yay another fellow knitter doing the 2 socks in one!
I am having the same struggles as you are with holding the 2 yarns. I tried to strand both on one finger and it drove me nuts trying to separate the two.
Oneyarn told me about the Clover Yarn Guide, so I went to my LYS and bought one. It's very handy, but it's still not the ideal having to swinging the yarn back and forth between the two socks.
So now i'm knitting with one strand in each hand since it seems to be the most efficient to me, but I am not a continential knitter by nature - so it's going verrrry slowly.
I can't wait to see everyone's progress!