Hold the work in the left hand and hold the other end of the circ in the right hand, as if you were knitting with straights.
The work will gradually move onto the needle in the right hand, turn it when the row is complete so that it is back in the left hand. If you can see in your minds eye working on straights and just ignore the fact the two needles are joined with a cord you can just knit flat with them.
Edit: SJ types faster than me
