I must admit that I am somewhat of a novice when it comes to knives. I have the love, but I don't really have the skill. This is a big problem when it comes to sharpeining knives because I don't want to have to send it back to the company for a re-sharpening but I am scared that I will screw up the blade because of my incompetence. How do you learn to sharpen a knife without a casualty (of a knife of course)?