What's the best way to eat an elephant? One bite at a time. I believe the same holds true for any large-scale goal, for any organization.
Napkins and cutlery are on the table, ladies and gentlemen. I hope you brought your appetites.
If they were advising an organization on the best way to achieve this odd culinary goal, Covey, McChesney, and Huling might lay out something like this, using their 4 Disciplines of Execution (2012).