There's very little you can screw up tbh.
On a desktop its easier but even most laptops it will be a breeze.
Just make sure you backup all your data on a harddrive or on a cloud (preferably a privacy respecting one ;)).
Even in the unlikely case that you do screw up. You can always go back to windows!
Its another nail in the coffin.
I'd still warn that a lot of people will not switch to linux anytime soon. There is a lot of fear about "command line" (for example) even though some distros (mint, ubuntu, popos etc) are pretty much turn key.
If you can help a less technically savy family member or friend change that would already be a good movement. But a lot of people still rely on MSOffice products (for example)
Some additional options might be using a burner outlook account.
Or, if you need to run some windows apps, a VM is always an option.
Tank-ism is basically the fanboy equivalent of politics.
They criticize right wing states and fail to see the failure of left wing states.
It's the inverse of MAGAites.
Tankies and MAGAites want you in the same concentration camps except they call them different names and they do it for different reasons.
OnlyOffice is a good bridge yes. But a lot of people have trouble switching softwares. Older people don't really want to "relearn" a new software even if its just MSword to OnlyOffice.
I do fully agree with you though.
The reputation of the terminal usage alone is enough to put a lot of people off.
I also think a lot of people confuse the terminal with actual programming (which is a fair point if you are not tech savvy). Then they think "I don't know how to program so I can't use this".
Linux communities can also be a bit elitist as you said. Which is a shame. I've heard people bash windows users only to then be toxic with the classic "How do you not know this?" when they ask basic questions.