Using a craft knife, bench knife, or straight chisel cut the top and bottom of the buckle latch slot.
Using a small round jar or cup as your guide, pencil a curved cutting line on the end of your belt. Cut along the trim line with a bench knife or craft knife.
An edge beveler can be glided along the corner edges of the top tanned side of the leather belt to remove a thin sliver of leather. This rounds the edge of the leather.