For patterning, I tightly wrapped the lower half of my face in plastic wrap and packing tape (BE SURE TO LEAVE YOUR MOUTH OR NOSE OPEN FOR BREATHING. In fact, having a friend help you here is so much better). I cut that open from the back, then snipped away at it until I had flat pattern pieces. Two for the front, an under-chin piece, then two for the neck. Then I made a copy in paper and made sure I could tape it together smoothly:
And that’s your pattern! Basically I just drafted the pattern directly onto my face.