I just got one of these lights and installed in less than 10 minutes.
1. Remove the climate control panel with a trim removal tool under the bottom edge of the panel and pry. It comes off fairly easily and it's just a faceplate(think removable faceplate on a car stereo. Disconnect wiring connector and set aside.
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2.Now use a trim tool to pry up the panel around the gearshift and mode selector panel and free it. I didn't take the shift knob off or remove the panel. I just moved it around as need to get access.
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3.Now it's very simple to pop up the storage area bottom in front of the shifter panel. Again, I did not remove, but if you want to, disconnect the wiring from the outlet and the USB connection. I just moved it around as needed.
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4. Next remove the silver trim and side panel by removing the bolt in the below picture and then pull the panel up and back. By moving the other panels you've left connected around a bit you can remove this one altogether.
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5. Once this is out of the way, you can easily pull the panel with the seatbelt annunciators out. You'll see a wiring bundle on the R/H side that has multiple connectors running to the annunciator panel. Taped to that bundle you'll see a small white, two contact connector. Pull it loose and connect to your light. Put the light in the hole in the panel so that it fits in and then turn to lock in place.
6. Reinstall everything in reverse order and you'll be good to go. The light seems to be controlled similarly to the footwell lights, it varies in intensity based on whether the car is running and what position the shift lever is in.