The first step is to obviously get a piece of tinsel.
Divide it in half
Place the tinsel on 2 fingers
Spread your fingers apart so that the tinsel makes a triangle, while you use the other hand to make the tip of the triangle.
Pull the ends through the triangle so you get a knot around your finger.
While the tinsel is still on your finger, grab a few pieces of hair. (2 or 3)
Slede the loop onto the hair, and tie a lot of knots, and here you go!