The pattern I was using was not written for the novice sewist. The instructions included steps such as "neaten edge" and "insert zipper", assuming the reader would know how to do these things. It made me really glad I took that zipper class last fall, because now I am able to "insert zipper". In fact, I had to decide which of the three ways I learned. I settled for a lapped zipper this time.
It's still such a new skill that I am always a little surprised and pleased when it works like it is supposed to.