I'm gonna go ahead with him, at least the headache to install isn't on me.
He will share the model of the switch that he'll install, I'll ask y'all if it isn't good. Then maybe I can buy my own and just plug it in.
Question: How do I test his wire before he installs it? I just want to be sure of the quality before I invest time and money. I'm guessing plugging one end into my router, another into my laptop, and speedtest? What about latency/ping tests?
Wire probably can only be checked by branding and connection speed after it is connected to a pc with router. If both router and ethernet port are gigabit, pc should show gigabit connection in network settings.