joining Win 2003 AD domain

Here is the situation. Until recently we did not have or use Active Directory or domains. We now have a Windows 2003 Server running Active Directory. All of the workstations are running Windows XP sp2. I am slowly adding the workstations to the domain but would like to know if there is a way to do it without having to 1. join the domain, 2. reboot, 3. logon as the user whose computer it is so it can make a profile, 4. log on as a local computer administrator to copy the computer users profile to the new domain user profile. Because when you do this I find that you then have to fiddle around with Outlook to make it work correctly and still be able to import the backup into the new user. Also, it causes problems with some applications so I thought maybe there is a way to do this that would allow the original user to join the domain and not have to copy profiles. One thing you need to know is that at this time all users who aren't on the domain yet log on to their computer with the same username so I realize that I will have to change their username on the local computer to the username that is set up in Active Directory.