All that is needed to add Context Hub to a page is in fact adding the tag as documented on the referenced  page.
Regarding testing, if you want to test if segmentation is working, please check the admin docs . If you want to debug errors you are getting with Context Hub itself, please check diagnostics page .
The actual usage of the content hub and what it does is provided from the perspective of the admin , who needs to define the segmentation, and the author who needs to manage audiences  and view pages against Context Hub data .
Thanks smacdonald2008, I am also looking for a comprehensive document that tells sample steps to use Context Hub and make use of context-hub to deliver targetted content without using a Adobe Target account and only using Context Hub - is that feasible?