Thank you, Shane. I did use 'dd' to write the Debian Live ISOs to USBs and that did work (though the documentation for 'dd' was wrong). A gentleman on the debian-live list helped me.
What didn't work was this: When I attempted to install from one (booted) USB (running Debian-LXDE) to another USB, after much fiddling, I managed to get the install to copy over the operating system (took over 1/2 hour), but then it failed trying to write GRUB or LILO.