Hello,
I agree with beppe above. "Thumbs up" to his suggestions.
Since you are looking for a manual procedure, then you can manually remove the registry via Manual Uninstallation Documents provided above or provided below:
Manual uninstallation documents for Symantec Endpoint Protection
Incase, you are looking for removal via the CleanWipe Tool, then you could create a Case Online and the Technical Support would provide you with the Tool.
How to update a support case and upload diagnostic files with MySupport
http://www.symantec.com/docs/TECH71023
Create and Manage Support Cases
http://www.symantec.com/business/support/index?page=content&id=HOWTO31091
Hope that helps!!