The most difficult part of dpns is the firn few rows. Try casting on all the sts for the beginning of the hat onto the circular needle but don't join to knit in the round. Knit back and forth on those sts for the first few rows and then knit onto the dpns and join the round. It will be easier this way and you can close up the small gap when you've finished the hat.
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For single loop: Place a marker at the beginning of the round so you know where you are. If you run out of cable before you go all the way around, just pull out the right hand needle and keep going til you reach the end.
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