For electrical connectors, Honda's especially, it helps to remember that the bracket that they are clipped onto often times serves as a lock - you can't separate the two halves of the connector until you remove it from the bracket that holds it in place. Once off the bracket, give them a good push in first, then try to pull them apart....
Unclipping (electrical) the engine coolant temperature sensor and reattaching it (barehanded both) was quite challenging. I can't see how anyone with hands larger than mine would be able to do that without a tool-based solution. If you try it barehanded, my advice would be to use the cable attached to the electrical connector, and not the body of the connector itself to align the clip before pressing it home for reattachment. I don't advocate pulling on the cable for detachment.
The two things that tend to frustrate me are electrical clips and any kind of rubber hose that: a) has been clamped to the same surface for twenty years, or b) needs replacing such that new hose needs to be installed. I have great difficulty getting the pinch clamps on over the flared end of the pipe after the hose has been installed.
I do have a dozen cuts/scrapes on both hands, though.
Those are absolutely normal coolant temps for a properly functioning Insight engine cooling system. Good deal.So here's the assessment after a half hour test drive on 50 mph limited secondary roads:
Coolant temp as measured with ELM327 Bluetooth scanner and Torque Lite for Android -- mostly between 197.6 - 199.4 F, with very occasional (like three times for maybe 30 sec., peaks of 203 F).
Looks like mpg could be up by 1-2 (perhaps due to EGR plate cleaning). We'll see what develops over the longer term.
As the Brits would say -- absolutely chuffed that things seem to have worked out.