Good points Frank, I will add one more, my neighbor had a ground wire (thin braded wire) that was left connected to the ground while he was replacing the sensor, the lamp shifted, and the wire ended up breaking at the connection on the lamp. Took a half an hour to disassemble the lamp, find a suitable crimp lug, replace the wire, and finish the connections. So my suggestion, remove all of the connections, label if you need to and set the lamp housing on the ground, remove and replace the sensor, then make the connection to the lamp.
Set the lamp in place temporarily, test the sensor, then install the screws.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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