Since it's just practice, all you'll need are:
Let the cable needle slouch away from your work and knit the next 3 stitches with your regular needles. Be sure to pull that first stitch tight, don't be afraid to finagle things.
Then knit the 3 stitches that are on the cable needle, pull tight, don't forget to finagle.
YAY!!! That's all it takes! So now you'll think of it like this: the pattern is 6 rows long so for rows 4,5 & 6 you will knit the knits & purl the purls. *Don't forget to keep track of rows on paper.
After the 6th row you start over: rows 1 & 2 you knit the knits and purl the purls and row 3 is where you cross over to the dark side - oops I mean cross over the stitches. Too much Star Wars. Do this as long as you like, I find knitting to be so relaxing..........