How can I assign a template to only be available to a specific user?
To assign a template to a specific user, you will have to edit the database. There is a field in the templates table labeled "user_id" which by default is set to NULL. If we set this to a user id, it will assign that template to only that user.
For example, the following command:
mysql> update templates set user_id=243 where id=373 limit 1;
This will assign template with the ID 373 to the user with id 243.