Calling wordpress experts main domain name change help please

Hi everyone

Well when I started with wordpress my main domain name was mydebtfreejourney dot org but I dont really use that now.

I have an addon domain marcuspassey dot com which is what I want as my main domain now and it has a customised header and paid theme( I dont have my header saved on my computer either). I really dont wanna bugger it up in any way I have to start my mentoring next week with Alex Jeffreys and need this site how it is without any mistakes.

I also need to update to wordpress 2.8 is that difficult?? as I say all stuff like this worries me incase I lose anything or my blog disappears,the thing that worries me is I have to remove the addon domains from cpanel and once main domain change has taken place add them back. What happens if my marcuspassey dot com has disappeared or not as it was?

This is what it says on the change domain form

WARNING: Because of cPanel limitations, make sure you backup and remove any addon/parked/subdomains from the account before submitting this form, or else this domain change will fail.
If you remove the addon domains through cPanel, the files for the addon domain will remain on the server. Once the domain name change has taken place, you can then readd the addon domains via cPanel and all the addon domains will go back to the way it was prior to removing them


Anyhow just wondered has anyone performed a domain change and added an addon domain back in its place?

cheers

marcus