I inherited this drill recently with no operating instructions. I am an older female, my last drill had both a cord and a chuck-key. I am trying to complete some projects and cannot seem to get a straight answer as to how to accomplish this. Can you please instruct me as to the procedure? I was told to hang on to the chuck while I activate the drill in the "open" position. I almost tore my fingers off. I am a stage 4 cancer patient and cannot do this type of maneuver. Please Help.