So as it is easy, please challenge!!
Step 1: Cut Leather along a Template
When I cut the part of the curve, I cut to turn a template.
I can easily cut the one!!
Step 2: Scratch the Leather Backside
In that case, the leather is strongly glued together.
Step 6: Make Holes in the Leather
Step 9: Completion!!
Please watch the video of the these steps.