Once a family leaves their home, they’re transported to an orientation center. Rae and her family said they never saw the outside of the center or saw any other witness families. However they could “sense” their presence at the facility. Once they were assigned a location, her and her husband had to study their new city/state. More importantly they had to study up on the region where they were supposedly from.
While they lived there (waiting for new birth certificates, social security cards, etc.) they also rehearsed their cover stories, practiced signing their new names, and even just responding to their names. When you’ve never been called ‘Sam’, it takes a lot of practice before you’ll actually turn around when ‘Sam’ is called.