I'm not affiliated at all with Iron Valley, but I just want to second what the author said: almost all the references you need are on the printable reference sheets and fillable forms. I have the "game creation" worksheet and three* move sheets printed out single-sided because I don't like flipping pages, but you can easily condense those down to two pieces of paper by printing double-sided. Those plus the calendar (which I have as one double-sided sheet, because I only need to see one season at a time) cover pretty much everything!
Since my first session, I've only brought up the book while playing if I want to use one of the many roll tables (which you can use one of the handy oracle sites for instead) or I need to check details on one of the festival days.
*Edit: I just remembered, I think I might have condensed the move sheets into fewer pages by putting more of the tables on each page? So if you do it as-is, it's probably more than 3, but you can easily combine them to fewer printings.