Upgrade Active Directory

Does anyone have any advice or tips on upgrading an Active Directory environment to Windows Server 2003 from Windows Server 2000? It’s a single domain controller. I’d like to think that it’s as simple as setting up a new machine running Server 2k3 and promoting it to a Primary role, but I’m not so sure from all the things I’ve read. Just something I’ve been wondering about. If you know, please advise.