Complete tutorial from when you buy your leather and how to cut it square (actually rectangle :) ). Includes tips & tricks during the process, plus exact dimensions for the Passport, Regular/Narrow, and Wide/A5 Traveler's Notebooks.
My first video for supplies: https://www.youtube.com/watch?v=lAN3ebH5txk
My Wide Traveler's Notebooks setups: https://www.youtube.com/watch?v=shf5kj2KouY