Instructables

Step 7: Tempering

The easiest step I believe. Put the blade into your oven, and bake it for 415F for 2 hours. Once it's done, take it out, let it cool, and back in at 415 for 2 hours. This relieves the stress in the blade, allowing it not to shatter when sneezed on. Shouldn't be any problems here. 

However, don't delay at all. I had mine in the oven before it was cold. Don't put it in steaming hot, just at a nice warm touchable temperature. The more you delay, the more likely you'll bump it and have it shatter. It's like having an open wound, there's no reason to leave it exposed to bacteria and all that stuff. 
 
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