TomD
It is just woodworking, you are removing a minute amount of wood. If you clamped a paint stick sized piece of wood low in you vise so it was stiff, and tried trimming it with a file, or chisel, or sandpaper on a stick, or nail file, etc... You would get a good sense of what it is you are doing. Sometimes there are sneaky little tricks, at other times it's just woodworking.