When you wish to change the location of your user profile folder, you don't have any tools at your disposal, except step-by-step manual solution.
Recently I had to switch AD domains on some laptops, and users got a new profile (since they, in fact, were new users). I found that switching user profile folder path was not something that wan not possible out-of-the-box.
Here is how you do it manually:
Log off, and log in as 'SomeUser'.
Use System Restore in case something goes terribly wrong.