How to change 'client' name in Taleo URL

Summary:

Our company is rebranding its name, hence we need to modify Taleos internal and external facing URL to display/reference the new company name.

With this in mind, we require guidance on the change process, and how to effectively test these changes before going live.

URL format: 'https://<Clientname>.taleo.net'
We are looking to change the <Clientname> across the board in our Taleo service

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):