Apparently I have! I wrote this when I started the project.

Essentially, I'm walking across every page of the A-Z, without going off the top or the bottom of the page (going into the margins is OK). I'm also keeping a continuous line. Oh, and I'm not allowed to cross the streams (i.e. intersect with an earlier line of walking), though I am allowed to go back on myself (e.g. I can walk down a road to get to something I want to photograph and then walk back to the intersection and carry on).