We moved into our new home we built June 1 and I had the same concerns you had because they had only known the apartment we were living in until the house was finished.Initially, I closed the doors to all the rooms so they could explore and they had a doggy door also so I let them go investigate their new yard.I spread puppy pads in the areas they were used to using and put their toys and food where they could find it.We did have some accidents but they are getting better and used to the new home.I try to be with them as much as possible to make the transition easier.Cathy and Yoshi