Reformation

It must be considered that there is nothing more difficult to carry out, nor more doubtful of success, nor more dangerous to handle, than to initiate a new order of things. For the reformer has enemies in all those who would profit by the old order, only lukewarm defenders in all those who would profit by the new. - Machiavelli

Any time you want to institute change, spend more effort on the people affected than you did on the details of the change.