Hi there. When you get used to them you're gonna love them! Okay, when you come to the end of a round, just keep right on knitting. Don't turn needles. And yes, purling and knitting are the same as on straight needles. Cast off is the same also.
My first attempt with DPNs sent me to get circs too. Don't despair just keep trying and you'll LOVE them!! Hope this helps