My first time trying to get my mother to switch from Windows to a Linux based OS wasn’t successful because there was too much friction and inconvenience for her, and she wasn’t willing to even entertain the idea of Linux for years after that. My second attempt was successful because Linux is much more user friendly than it used to be 13 years ago, and I changed my approach to make it as frictionless as possible.
Firefox just set to block 3rd party cookies + some basic extensions like adblocking and some easy privacy stuff is a good way to go about it, because it’s better than what she used previously and it doesn’t become inconvenient to her. She doesn’t know what an operating system is, or what cookies are… She just uses the computer to browse the web, emails, and light office work. She even says she prefers the current setup (though that’s because her old computer was chugging with Windows and runs smoothly now with a less bloated OS)
No need for noscript, deleting cookies, fingerprinting, or user agent stuff… Only introduce these to them if they express interest in privacy and are interested in learning more. If you try to thrust it upon them too suddenly they will just think “Linux isn’t a good user experience and is only good for tech enthusiasts and programmers”.