What length needles do you have? I can knit hats on 24 or 32 inch, but there's a trick to it. When you go to join and the stitches won't meet, pinch the cord about halfway around, and push the stitches toward the ends. Join and start knitting. When you get to the cord, do it again. Keep doing this for a couple inches and on the 24" needles, as the work grows you won't need to do that until you begin the decreasing. On the longer ones, you will need to keep pulling a loop of cord out. This is like the Magic Loop, but you don't need as long a needle as that recommends (40" or more).