During the design process I sketch and cut out various patterns. Sometimes I finish up the drawings in Affinity Designer and have my son cut them out on his laser.
I have lots of hand tools from all over the world. My skiving knife is hand made by Terrick of Chartermade in South Africa. My go to pattern knife is a chip carving knife.
When you wet mold leather for a holster you bring out the detail from a process called boning. It is called that because bones and antlers where and are used because of how smooth and hard they are. I use metal teaspoons and printmaking burnishers that I polished.