Thanks for the helpful response! So they need to find nodes with minimum channel sizes that aren't out of their reach. For that kind of simple use, should their channels be public, or private?

Private

I think this is where it starts to get complicated. Yes, private channels, but then I think the counterparty needs to support trampoline or whatever it's called and/or your invoices need to include routing hints. I'm not sure of it all with regard to private channels, but maybe it has gotten better last I checked?

Private works fine for spending, though. It's just receiving that gets complicated.

indeed