This is the video about how to perform a single cast on. To work this open cast on you'll need one needle a couple of sizes larger than the needles you'll be using to knit with (or alternately, two needles held together) and a spare length of sturdy yarn several times longer than the length of the finished cast on. Make a slip knot with the working yarn and place it on the needle. For this cast on you only need to leave a short tail -- you'll be working with the yarn coming from the skein. Hold the needle and one end of the waste yarn in your right hand.