1) avoid problems like this, and
2) clean up problems like this when they do happen.
And even so those traditions never, ever (in my experience) describe themselves as anything other than perilous. "The way is long and narrow." "Like a snake entering a bamboo tube." And so on.
I put together a system for solo practitioners working with absolutely minimal oversight in 2015. People doing it since then, I talk to them roughly once (on average) to check they're doing it right, then don't hear back from them for years until they're getting into the weird "foothills of enlightenment" end stage stuff -- if they make it that far. Most don't, they plateaux. Which is fine, that's a good, safe place to be.
Instructions here. There's a bunch of other stuff in that same directory structure. It's fine.
http://files.howtolivewiki.com/.meditation_2015/transcripts/...