Qmerit installer inadvertently damaged the plug assembly on my Emporia LV2, so now I have to play electrician...

So I opted for the Emporia charger for my second home LV2, had it installed a couple of weeks ago, and still haven't used it yet. My installer did a good job for the most part, but at one point, he dropped the plug head on the driveway (about 5.5 feet) and it made a solid "clack" on impact, despite being wrapped in bubble wrap still. I'm sure he thought nothing of it and I didn't figure it would have done much, either. To my chagrin, I took a closer look after he left and saw that the trigger of the "gun" was scuffed pretty good and the plug collar where the trigger slides through (and what keeps it from moving up too much when unplugging) was cracked and just broke off in my fingers. Not a difficult fix and I was able to get Emporia to send me a replacement trigger and collar at no cost.

Unfortunately, while this is a pretty easy fix, it does require me to disassemble the plug head and work with the wires connecting into the actual plug prongs themselves. I'm no electrician and not real fond of working with things like this, so what is my best route to handle? The Emporia rep said he would have to advise throwing the breaker for the charger AND throwing the main to be safe. My power company has an EV guru and he just said the charger breaker alone should be sufficient. Do any of the more electrically-knowledgeable folks here have other suggestions? Should I wear a pair of insulated gloves, too (which might limit dexterity)?

I'm sure I'm overthinking, but I don't want to baconize myself and win a Darwin award for my efforts.🙃 Instructions on the process from Emporia are below.