Hi 224,
Normally you can make the template over your existing hair--unless you've got so much hair that the template won't fit snug against your scalp. Then you should shave it or at less water it down. It's a judgment call on your part. There' s good video on how to make a template on 'You Tube.' Just do a search under 'hair template.' There's an example to a CC front contour on our site (and the other contours) under 'How to Order' the hit 'Order Help.'
Regards,
John