Using these HQProp Ethix P3.3 propellers is easy. Just make sure to match the CW and CCW propellers correctly to your device as per the instructions. When installing, handle them gently to avoid any damage. During use, keep an eye on the propellers' performance. If you notice any abnormal vibrations or noises, it might be time to check them. For maintenance, clean the propellers regularly with a soft cloth to remove any dirt or debris. Store them in a safe place away from sharp objects to prevent scratches. Remember, proper use and maintenance will ensure a long - lasting performance of your propellers.