I personally use a diamond chisel, with my motor nerve condition it's easier for me. I prepunch all my stitch holes after glueing and beveling my edges. If I'm using a welt it's all glued together, edges sanded, beveled, stitch groove grooved then I'll use the diamond chisel to make the stitch holes. I don't go all the way through and finish the holes with a hand held diamond chisel lining it up with the backside before punching all the way through.