Transmogrifier is a fantastic tool for moving content from one website to another. Simple, flexible and powerful, it makes the difficult tasks of migration easy and the impossible possible. But there's more to migrating with transmogrifier than just learning the tool. The everyday task of managing content can lead to complex problems. You need a plan. In this talk, we'll look at a real-world example of the migration of a large, content-heavy website from Liferay to Plone. We'll talk about where the hidden traps were found, the tools we used to get past them, and the knowledge that would have helped us avoid them in the first place.