Am I Qualified to do This?

Upon entering classes at the beginning of this semester, many of my classes had us introduce ourselves, and tell everyone one or two interesting facts. So, I figured being a self-published author is a pretty interesting fact about me, so that's what I told everyone.

About two or three classes later, two people approached me and asked me if I would help them out by reading/editing some of their writing. Being the nice guy that I (most of the time) am, I agreed and off to work I went. However...