Need help removing the visor

I am planning to install a dash cam in our 2018 GLC.
My plan is to wire it to one of the fuses on the driver's side of the dash board, and then route it up under the the A-pillar trim into the headliner.
Ideally, I would want to lower the headliner slightly to be able to place the wire above the headliner and in the process not damage any factory wiring that may be there.
Does anyone have any clues on how to remove the clips holding the end of headliner and the base?
Also, tell me if I am wrong but I understand that after removing the piece of plastic marked "airbag" I should be able to remove the a-pillar trim.
Thanks a lot.
Removing the "airbag " plastic should give you access. But be careful no to run the wire between the airbag and the plastic cover.

I hoped to get help with sun visor removal- cannot find any videos on 2016- 2018 GLC or C-class on YT.
Well, when the dash cam arrives, I will first check the possible connection and 2nd see if i can remove the visor.
Honestly, I am not even sure I would need to lower the headliner - it may be possible to 'fish" the wire without removing the visor/lowering the headliner.
The tricky bit is to run the cable for the rear camera. I can't be bothered to mess around with the cable duct, so ran my own instead.
Will post photos later


