Once I was tasked as part of a team moving a large Public Courthouse to a new location. It's something I'll always remember, and I'm reminded of it every time I'm involved in the migration of a new site to a new domain. Success is in the planning, and in successfully tackling small details.
First question I asked everyone is, "How many of you have never moved to a new home? Moving a courthouse is a whole lot more work." No one raised their hand. They can related to the challege.