How does one bootstrap DNS

[Jim Freeze]

Hi

I am wondering if the following is possible.

Suppose I own two domains: abc.com and xyz.org.
I want to host these domains myself and have them provide
the primary and secondary name servers for each other.

Is this possible? Seems kind of circular.

In theory I would have ns1.abc.com to map to the IP of abc.com and 
ns2.abc.com to map to the IP of xyz.org.
This will give me my primary and secondary name servers.

So, to set this up, I go the the registrar of abc.com and attempt to 
enter a name server:

   NS1
   ns1.abc.com
   1.2.3.4

   NS2
   ns2.abc.com
   5.6.7.8

In my attempts so far, the registrar has said that either the name
server is invalid or it doesn't like me entering just an IP address, it 
wants a name.

Is this a common practive, or do most people use a service like zoneedit.

Thanks

Jim