Get them to flash it with Ventoy, then they can copy and paste the ISO. Bit easier for dummies and let's them put more .iso files in it without the "but why can't I do more than one".

The BIOS is a lot scarier to noobs. You have to press a button very fast, go into a scary menu that looks different than anything else and full of weird options, to disable something that has secure in its name, and then something about boots to turn on the PC from the USB? But my computer has no boots!

Now this was made easier by windows which can be told to reboot directly on the BIOS or media drive, but it is still more daunting to newbies than to use a program to flash a USB in my experience.

Of course, that's why we need to be there for tech illiterate people to teach them how to read, without assuming they're mentally challenged because they're not stupid they just lack the willingness to try something that looks scary the first time you do it (like most things in life). If I got my mother, who can barely figure out how to open the file manager on windows, to install Linux Mint and some software in it over a phone call, it's possible with anyone.