Good Lord, all the advice for a situation I said that I have well in hand!
How?
ALL the rugs in the areas affected are removable, easily-cleaned area rugs a local dude will pick up and clean very affordably. The bare floors beneath are underlayment, not hardwood with crevices, that will easily vacuum and present a more flea-free relief to the dogs while the rugs are out. The rugs won't come back till the dogs stop shedding eggs.
Their dogbeds are easily washed over and over, and will be as things proceed.
The cats were confined to a different area during our absence, with mostly bare floor and one old W2W rug I'll be happy to nuke with chemicals because it's an area used mostly for storage. We rent-- can't tear this one out like I did the others in the past.
Hardi will nuke their dogyard with a chemical using Hardi's Handy Powerwasher to spread the solution, on a schedule that fits the flea life-cycle. Rain will wash it out before long. We have a large yard in the middle of nowhere, with no areas in miles that the chems will wash toward. The dogyard is in limited use now to limit egg shedding and flea transfer in it already; there's an alternate fleafree area (hard surfaced) they'll use for awhile that will be easy to keep eggless.
The upstairs areas (there are two separate upstairses) are totally flealess. Obviously Faulkner won't be coming upstairs for his occasional sleep-with-us opportunities for a bit.
The way this old house divides up into zones is a big plus for us.
Outside professionals are not needed-- I used to run a cleaning business and I know the drill.
Thanks all, but we're going to be fine. I just needed to blow off steam!