This was my first sensor change that happened on November 29th 2018.
The second sensor change was last night December 9th and it wasn’t any smoother. Especially I did it prior to the sensor completely ending. Therefore it took time to figure out how to update it on the receiver/phone. I was glad I kept all the information booklet and instructions so I could refer to it. Basically it is easiest to wait until the time runs out on your sensor. Your receiver will tell you the sensor is no longer sending readings to your receiver, it will alert you prior to 6 hours, 2hours and 30minutes to ending. That way you can just follow the receiver/phone step by step. If you must end it prior to the receiver/phone telling you it has ended, just go ahead and take the sensor off your body. Replace with a new sensor and place the transmitter back into the new sensor. Once you have done that, go on the receiver/phone app, go to settings and choose new sensor and follow the instructions on there. Dexcom definitely keep it user friendly for everyone to operate it.