How to move Joomla site from subdomain

I have created a Joomla site in a subdomain at Dreamhost (it has been developed and tested at the subdomain).
I have created the domain (in Dreamhost) where this site should run; the current registration for this domain points to the old site (which is not at Dreamhost).

I want to move the new site from the development subdomain to the new domain that I have created for it, and then change the registration to point to the new site at its new location.

I can’t use Akeeba kickstart, since I can’t access the new site until after I have changed the domain registration, which I don’t want to do until the new site is fully installed.

Can anyone tell me the easiest way to do this? (or point me to the right documentation)?