the book by carl monroe is very good, and the book offered by the ATSG [Automatic Transmission Service Group] is good as well, so the money spent on these two books is a bargain and a half if you want to rebuild your transmission yourself.
the 727 is arguably the easiest transmission to rebuild, and requires only a few "special" tools that can be easily fabricated, even if one has very limited fabrication skills.
i am no transmission expert by any stretch of the [my] imagination, but i have done several over the years, and have been successful.