I've "done" four of these Win 10 installs now, and a fifth one with my cousin over the phone. It was at that time that I let him make choices on his own before I discovered what had happened. Nothing wrong, really, but he's now complicated his experience with a Microsoft Account and password.
It seems obvious: "Whose computer is this? Do you use it at work or school?" Or "do you own this computer.?"
Pick the "work or school." You can then set up your own account name and password as you did in XP, VISTA, Win 7/8. And you don't have to expose yourself to whatever you could expect with Microsoft Live Account.
But that's a less significant problem. We just felt uncomfortable "upgrading" to Win 10, even with the option to revert to 7/8 in 30 days ( or whatever.) So we did clean installations on every single system (including my cousin's) by freeing up unallocated space on the boot/system disk and using it to install Win 10 for a dual-boot configuration. And that type of installation doesn't take a lot of time.