"Hero's Journey begins with the Ordinary World"
Sometimes, but not necessarily. Often, there is a distinct process leading into the Ordinary World, which may or may not involve Inciting Incidents, Minor Threshold Guardians and Supernatural Aids etc.
More info / buy the 2000+ stage Hero's Journey And Transformation Through A New World / State at http://www.clickok.co.uk/index4.html or http://www.kalbashir.com