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A sharp knife is an absolute necessity. New blade in the utility knife sharp, otherwise you run a bigger risk in tearing rather than cutting. They make specific tools for edging and slicking, but if you want to go a little easier route for a homeschooled holster, try a dremel with a couple different weight sanding drums. Wet the edges with a sponge and sand to smooth and round the edges (you want to avoid any and all square edges which have a tendency to snag clothing).