Micke - he means you cut the nock in at a downward angle so that you end up with some material on both sides of the string. There's a thread a page back (pros and cons of side nocks, started by thedukesarchers) that has links to almost all the material that has been published on the subject and explains it much better than I just have.
Will - good to know about the hazel, I'm aiming for 70-80lb so that will save me some work and money.