Double the size of a change and resistance to it increases by 4x. Triple the size and resistance increases by 9x. And the reverse holds true: a single big change split into ten smaller changes means each change will be met with only 1% as much resistance as the big one would have.
Obviously these numbers aren’t even remotely scientific, but the point stands. If you want to make big changes (whether they’re organizational, personal, professional, whatever) then split them up into teeny tiny little pieces.