TPMS: Why I Bypassed the Dealership

I went to my Toyota dealer, where I get service on my 2015 Sienna. A Tire Pressure Monitoring Sensor (TPMS) went out and it coincided with my new tire purchase at that dealer. Anyway I had a dead TPMS in the rear. WHen I asked how much to replace it they said ("BE READY FOR THIS"). $300.00 for one, but it's only $800.00 if I do all Three.... You can guess that I left. However while watching the "Car Care Nut" I leaned more about it......As you can see in the Video...
NOTE: " didn't use the "Tire Pressure Monitor Fitting Kit". I picked it up as a precaution.

Best Links: Always start with the Car Care Nut.
https://www.youtube.com/watch?v=kkJJabCQaqA&t=1138s

AUTEL Training Video:
https://www.youtube.com/watch?v=4VGdHuqQN68&t=56s

Easy to follow video from KDS Channel (simple but good)
https://www.youtube.com/watch?v=tW-vWXbJmYU

AUTEL Software Update Video
https://www.youtube.com/watch?v=GOq7nD8ikLw