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If you are referencing curved corners, purchase flat washers in various sizes and use them as a corner template. Cut slowly. There is a circle template on the market ... the name and source escapes me now ... which is laser cut out of metal. It looks like bubbles coming out of a kids bubble wand. It is a nice gadget to have, but the washers work just as well, and only cost about 25 cents each.
Good job! I did this with one of my brother's snake boots. Before I stitched the pieces together, I filled in the stitch holes the where the strap and buckle had been. Boots are a great source of study leather.
Being your first project, then it was outstanding rather than just good!
Good job you might consider using a saddle stitch. The advantage of a saddle stitch is that a half knot is tied with each stitch; thus if the thread breaks during use, the stitches won't come out . I'll used my vacuum sealer the next time I make a holster!
Good job. Nice stitching. Where did you get the branding iron?