Using this defrost termination cutout and thermal fuse is simple. First, make sure your refrigerator is unplugged. Then, locate the old part in your fridge and carefully remove it. Connect the new part using the bullet connectors provided. Once it's securely in place, plug your fridge back in. When it comes to maintenance, there's not much to do. Just keep an eye on your fridge's performance. If you notice any issues like improper defrosting, it might be time to check the part. As for safety, always unplug your fridge before working on it. And remember, if you're not confident in installing the part yourself, it's best to call a professional.