Using this Bondtech IFS Extruder upgrade kit is easy. First, check if you want to use the filament sensor. If not, you can use the extruder right away with the plug in place. If you want to use the filament sensor, remove the plug from the front housing and follow the guide to install the sensor and other accessories. When installing, make sure all parts fit correctly and are tightened properly. For maintenance, keep the extruder clean. You can use a soft brush to remove any dust or debris. Check the parts regularly for wear and tear. If you notice any issues, replace the parts as needed. Remember, the Prusa Filament Sensor, Filament Sensor Magnets, and Filament Sensor Steel Sphere are not included in the kit, so you'll need to get them separately if you want to use the sensor.