There is a class for just that right here
I've always knit socks in tandem, even when I knit with dpns, would have a sock on each set of dpns. I'm a 2 circ socknitter now, but I don't like to knit 2 socks on 2 circs, so I have each sock going with its own 2 circs
Just works perfectly for me
The class that I linked is very helpful, I used it when I gave knitting 2 socks on 2 circs a try, it's very detailed...have fun!