Using this Westinghouse WRJ600 Series rangehood filter is easy. Just take out the old filter from your rangehood and put this new one in its place. Make sure it fits snugly. As for precautions, always turn off the rangehood before changing the filter to avoid any accidents. For maintenance, it's a good idea to clean the filter regularly. You can soak it in warm, soapy water to get rid of grease and dirt. Then rinse it thoroughly and let it dry completely before putting it back in the rangehood. This way, your rangehood will work efficiently and last longer.