These wrist warmers use worsted weight yarn and size 9 needles so they knit very quickly. They make a great gift for others or a nice treat for yourself and are easy enough for a beginner. To do this pattern, you only need to know how to knit and how to do yarn overs, which is just wrapping the yarn around the needle in between stitches from back to front in order to add a stitch. If you want to add stripes, pick up a contrasting yarn or yarns of the same gauge and start and end them as you please throughout the pattern, taking care to leave 2-3 inches of tail to weave in in order to prevent unraveling.
One skein of yarn is probably enough for one pair unless it is really light or you want to make really long wrist warmers.