In late 2005, I managed and designed the upgrade of a corporate wide-area network. This involved a switch to a new provider. Hilarity ensued from day one. In this presentation, I'll be talking about my lessons learned from it, so that others may be spared from similar fates. Subjects include dealing with vendors, managing the cut-over schedule, and what to do when all hell breaks loose. There will also be a questions and answers session at the end.