It depends on the steel. Paul Bos is an incredible Heat Treater, Rob Simonich is also very good, too. Rob can do the oil quench stuff, whereas Paul Bos can olny o air quench steels due to environmental regulations. 1095, O-1, L6 can be heat treated at a machine shop..heat with oxy acetelyne torch till non magnetic, quench in oil, temper in kitchen oven.