It is so VERY IMPORTANT that you do not injury yourself. Make sure the height of the bed is right for you. Know the limits of your strength and be sure to have as much assistance as you can to tackle the job. Follow your facilities policy and procedure for re/positioning. As much as you want to help the kind lady or gentleman in the bed who is unable to position his/her self remember you only have one body yourself. Don't think, "just this one time..." that might be all it takes to tweak an injury in your own body.