Look at a traditionally published book; if you put
a ruler under a line on the left page, it will line up with the same line on the facing page.
Not exact matches
After you're done, go back and do it again — maybe with a
ruler held
under each
line so you go reeeeeal slow.
Apps
under the Windows Universal Platform can summon a digital
ruler for designing straight
lines, and Microsoft even showed off a touch - based stencil in Illustrator thanks to some close work with Adobe.