GMC Airbag/ Impact sensor

[Rmerritt]

GMC Sierra 1500 4x4 2012. Went to a mechanic to scan why my airbag sensor light was on. He said my passenger side sensor was bad. Can someone tell me how in the !@#$ im I suppose to get to this screw which is located on the opposite side? It has a bout a half an inch of room. I know you need to disconnect the battery and so on... just dont know how i can get this off or even back on. Is there some trick or special tool? Ive included a couple of pics for reference. The top of the screw is where I circled. Any help would be MUCH appreciated.

[Duelin]

That screw fits into a slotted hole. Take your e torx bit and loosen the screw from the bottom just enough to slide it in the slot. Once you slide it to the bigger part of the slot it will fall out.