Using this vintage Singer leather sewing machine is quite straightforward. First, make sure it's placed on a stable surface. Plug it in and turn it on. You can start by threading the needle following the guide on the machine. When you're ready to sew, place your leather or fabric under the presser foot and slowly start moving it forward as you operate the pedal. As for maintenance, keep it clean by wiping it down regularly with a soft cloth. Avoid using harsh chemicals that could damage the leather parts. When not in use, cover it to protect it from dust. Also, be careful when handling the needle to prevent any injuries. If you notice any issues with the stitching or the machine's operation, it's a good idea to have it checked by a professional.