No! I think I might actually have a much easier plan.

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An exchange fitting! That might do it. I am not sure how well it will work, though it is worth a shot. Rather than replace the (mostly) functional water valves, I may see if they have a female to male fitting which would span the sizes. Tomorrow, that is what I will do. It came to me today, but I had other things going on and could not get to the hardware store. That, I think, might be a lot easier.

As for adding valves to the outlets, that may come sooner than later. The previous owner had purchased inline water heaters to replace the existing ones. The downstairs heater is currently gas, the upstairs heater is currently electric. The replacements are correct for what exists. Now, with inline, would I really need to add disconnect valves at both the inlet and outlet piping? I do not know (though I think maybe more so than ever). Still, unless it is proscribed, I would probably go ahead with it. Of course, on those items, I do believe I will eventually have someone else install those.

When I figure out how to get the cash back as a first time home buyer, I plan on having at least a furnace installed (perhaps central air or a swamp cooler depending on how this summer goes). He might be the guy to ask. Even if he does not do this, he would very possibly have a good handle on someone else who does, what is required, how easy of a job it might be, and such. No, no, after the sink and for now, I think I'll stick with having even bigger jobs done by professionals. I am clearly out of my league. Actually, it might be a good thing the faucet "happened". I might have seriously gotten in over my head. Or, more over my head.

Breath... Breath... (kick something?) Breath... Nah, it is not really that bad. More like being somewhere you cannot bend over and having an itch on one's ankle. Yeah, something like that. Well, except for a few moments during or right after it all seems to go wrong...