Once you have a few pages cut, you won't need the ruler, because the previous pages will act as a guide. I cut about 1/4 inch deep.
I then covered the facing page with some old text pages from a vintage mini book and glued all the pages together with a glue stick.
I stamped an embellishment using one of the stamps from Tattered Angels, Flowering Vine line.
Now, that's the smallest altered book I've seen...makes me want to find more of these mini books.
I also wanted to share this great book of vintage children stickers I found. It has lots of very small images that are really cute. Although they have this white boarder, you can cut that off and use for your projects.