if anyone else wonders I've answered this here: https://www.duolingo.com/comment/9508431$from_email=comment&comment_id=9702522
Can the "sig" here be replaced with something else, like "dig" to change the meaning?
Yes and no, but mostly no. It's grammatical but nonsensical to say "det kommer att ordna dig", it just doesn't work. If you mean to say "it's going to work out for you", you just add "för dig" at the end of the sentence.
Well, in English, it in this sentence is going to work out, so you could have the same feeling of something live there too… :P
ordna sig is a reflexive verb and sig is the same for han, hon, hen, den, det, de so it doesn't necessarily refer to a person (or even to a singular unit since it can be plural too).
ordna as an active verb is like Jag ordnar det här 'I'll fix this' – subject, verb, and object.
But if you want to say that something will work out, we say that "it will work itself out".
Hope this helps!
We just have to get used to the fact that reflexives are used in many languages for things in addition to doing things to oneself, such as intransitive or passive versions of an expression.