use the hosts file on your PC to map the domain temporarily. Linux: vi /etc/hosts Windows: edit C:\windows\system32\drivers\etc (from memory..could be wrong..been a while and I don't use windows).
syntax is very simple:
so as a demo say your server is 192.168.0.101 then
Save and Exit...You can set as many domains as you want this way and only YOU will see them that way....Just don't forget to remove them when you go live cause you could go nutts later trying to make changes and your hosts file is overriding them on your machine...
again this is done from the machine you want to view the sites from...not the server itself...