No need for hooks or needles! :D But you’d need a tapestry needle to sew the headband together.

Basically, finger-knitting produces a long strip of knitting. For the headband, we’re going to make 6 strips of knitting and join them together lengthwise as we knit.

The length of your headband may vary according to the kind of yarn you use or the tension of your knitting. You can wrap the first knitted strip around your head after 40 rows, as suggested in the tutorial, and see if the ends will meet with a bit of stretching, and if you need to add or take out a row or two. If you’re making it for somebody else, make the headband a couple of inches shorter (when unstretched) than the person’s estimate head circumference. I think an average adult head is 22″ around.