This is the youtube clip I found. I liked this one because you just keep knitting with your needles. No need to change to any other knitting tool. It's not complicated either.
K2, RnK2tog (Right needle knit two together--like you do the 'k' of the 'ssk'),
K1, RnK2tog, K1, RnK2tog, K1, RnK2tog...etc.
So now my neck warmer is ready for some blocking and edging. I found a leafy edging in my Knitting and Crochet Bible that I decided I must use. That's next on the needles.
What stretchy cast off do you like using?