I purchased a Craftsy web-based class on lace knitting.  A swatch of the final project was knitted using a multicolor yarn and the knitted lace end was photographed in process to show how the lace edge is added by incorporating it while binding off the end.  The lace edging grows perpendicular to the body of the scarf.

Using Manos del Uruguay FINO yarn in Amethyst Earring and size 4 needles the provisional cast on was performed using blue cotton yarn in one instance and a circular needle in another instance.  I love the idea of using the circular needle so that the provisional cast on stitches are ready to be knit without taking any additional steps.

After  blocking, by soaking the completed scarf and pinning it to stretch it out, and weaving in the ends after blocking (so that the woven ends don't impede stretching of the scarf), behold the final product!