Creating booklet without reformatting

[Acesfull145]

I have a pdf that I converted to word and looks great on full, single pages. However, I want to create a half-fold booklet. I know how to adjust this in "margins" - "book fold" but it throws the whole document out of whack. Is there a way to prevent this or a different way I should go about it? It's 26 pages long and would take me all day to re-format each individual page. Thanks