A Murphy bed is a wall-mounted cabinet with a powerful spring or piston mechanism, so it is both an installation and a safety project. Releasing the counterbalance tension and detaching it from the wall studs are the critical steps.
Pro tip: If you do not have the manual or are unsure about the spring mechanism, this is a job worth paying a handyman or the manufacturer installer to handle.
Watch out: The spring or piston counterbalance is under high tension and can cause serious injury if released incorrectly; follow the manual exactly or hire a professional.