Renaming all computers and joining them to new domain

Hi guys, 
I'm really hoping someone can help me out. I'm an IT Admin with no actual training (please don't ask lol) so I'm not very knowledgeable and everything I've learned has been by reading forums and trial and error.
What I need to do is: rename all of the computers on our domain (about 160 of them) to a simple naming system (we'll say comp1, comp2, etc), join them onto a new domain and reconnect the appropriate printers to each. Also, for some reason it is required
I manually enter the DNS server IP in order for it to see the new domain and be able to connect. 
In the past, I've learned that you have to reboot machines between both renames and domain changes so I understand that. What I'm trying to figure out is if I can do all of this by running some sort of "script" or by a group policy or something
instead of doing everything manually (which will require an entire weekend since I have 8 locations to do this for). The machines are WinXP and Win7 and our AD server is 2008 R2.
Also, how does deleting DNS/DHCP records affect anything if I were to delete them during this process? Am I supposed to for a big rename project like this? I only ask because when I've accidentally named a computer to a name that was already on the network,
that caused an issue with DHCP. If you do have time to help me out, I appreciate it but I'll have to request you speak in somewhat laymen's terms. I apologize in advance if I frustrate anyone :) 

You can script that using netdom.exe: http://support.microsoft.com/kb/298593/en-us
For the DNS records, their updates should be done automatically if you have Dynamic Updates enabled on the DNS level. As for stale DNS records, they will be removed automatically if aging and scavenging is already configured.
How to secure DNS updates on Microsoft DNS servers: http://social.technet.microsoft.com/wiki/contents/articles/21984.how-to-secure-dns-updates-on-microsoft-dns-servers.aspx
How DNS aging and scavenging works: http://social.technet.microsoft.com/wiki/contents/articles/21724.how-dns-aging-and-scavenging-works.aspx
This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.
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