Are you repeating everything within the brackets  twice? Basically to lay it out the row goes: Slip 4 stitches onto cable (hold in back), K4, P1, Knit 4 stitches from cable needle, P1 (2), K4, P1 (2), K4, P1. Then repeat this again within that same row. I'm not sure if that helps but sometimes I need to lay everything out in front of me to be able to see it. I hope that helps I'm never sure if the way I think helps other people
good luck. I'm knitting them too right now!