Move bed with mattresses; disassemble required; up one flight of stairs to garage

Items to be moved: 1 bed and mattresses (mattresses included). Additional information: The bed is being purchased from a private seller via Facebook. The bed is currently assembled and located up one flight of stairs. We will also move the mattresses. Destination: the owner's garage; no assembly is required at the destination. The most important requirement is access to a truck and the tools needed to disassemble the bed for transport. The husband and son will assist with the move.