Name change

Hello! Sorry for the perhaps stupid question, but... We have 2 10.4.x Servers running AFP, SMB, Web, and OD (one a master, the other it's replicant). In a couple of months we will need to change the IP, the DNS-name and the computer name. Present (not real) computer name: mine DNS: mine.ours.com IP: 123.456.789.1 Future (also not real) computer name: AB126ES0001 DNS: theirs.ours.com IP: 10.100.100.1 Can someone give me a blow-by-blow on how to do all three changes? I've done changeip on a test platform several weeks ago, before I knew I would also have to change the computer name. Can I just do a normal changeip and then afterwards chnage the computer name in the System Preference / Sharing panel or will this irreversibly munge things up? Thanks in advance!