It's a very simple procedure Dan. A 1/4"to 3/8"" thread wrap under the nock is all it takes. You can use any ol thread, be it cotton or polyester, makes no difference. No special knots or any thing like that needed. Just start wrapping the thread right under the nock, and when you get the amount of wrap you want, snip it off. Now take some fletching or wood glue and swipe it around the wrap (couple times at least).
90-95% of the time the nock will bust off with little to no damage to the taper. Most times it's a matter of removing some damaged plastic nock and replacing with a new one. Sometimes a little wood repair in in order to the taper. But I have never ever had a shaft split that was nocked wrapped. Here's a few pics:
