Ah, idioms - the best reason to never, ever, ask for a literal translation.
I was wondering, is there one in French which would be equivalent to the English “having all your ducks in a row”?
Merci!
Here’s a picture of ducks in a row while we’re waiting for clairobscur and kobal2 to appear. 
Per my French speaking gf, there’s no real idiomatic expression.
“Avoir les choses en main” would be the closest; lit. Having things in hand.
Might “Tout en main” be better?
I’d see those as meaning more “I’m on it”, focussing on getting on with something, whereas “ducks in a row” means getting the groundwork in good order - related but not quite the same thing. I’d say something more prosaic like “J’ai mis tout en ordre” or “tout est bien rangé”.
You’re right. Bien rangé sounds much better, but I’m not sure it’s quite right.
le poop en le group
Nope. “Bien rangé” refers to well ordered material things. Your bedroom can be “bien rangée”, your vacation plans or whatever can’t.
But I can’t think of any equivalent idiom out of my head. “Avoir les choses bien en main” isn’t a bad idea, indeed, even though the meaning is slightly different (more like “having everything under control”).
How about “Aligner les canards”?
Vernacularly speaking, we’d probably use the verb *gérer *(to manage) in a variety of creative ways. “C’est bon, je gère”, “c’est géré”, “ca se gère sans problème” etc… Similarly with *maitriser *(to master/to control) - “je maitrise”, “il maitrise dans son job” “c’est bon ça on a maîtrisé” etc…
I’m struggling to find a more idiomatic or literary way to say it however. “Avoir les choses en main” does work I suppose. I think we’d probably switch to a noun, that is to say rather than saying that “X has his ducks in a row” we’d say “X is an Y”, where Y would be “a person who has their ducks in a row” 
This would only confuse the French, whose ducks are notoriously unruly.
Or an “-ard” adjective derived from some such concept? Not meaning to boast, but I was once described as “débrouillard” (meaning, someone who tends to sort themselves out/ find their own way around without crying for help - but that tends to imply you might have been in a mess in the first place, so not with all your ducks in a row). Maybe too, that’s too descriptive of a characteristic, rather than any specific situation.
Maybe the whole business of “colourful” business metaphors just doesn’t exist in philosophy-conscious France?
And here I thought the Norwegians had the wild ducks.
A duck once bit my sister.
That’s a vile canard. Les canards français sont très bien élevés
But things like paperwork and pre-prepared answers can be, right? Which is the sort of thing for which one might use the phrase.
Hmm… how about J’ai bien preparée? (Feminine because it’s Nava)
Et aussi ils sont bons éleves.
Is it just a coincidence that this week we’ve had two threads on French ducks?
Could the culinary idea of “mise en place” apply?
Come to think of it, where does the English expression come from (or refer to)? Is it supposed to evoke a shooting gallery at a fairground, or what?
That’s a perfectly fine sentence if you’re refering to actual ducks in an actual row. The problem is that since rows of ducks don’t appear in any French idiomatic sentence, people are going to understand it litterally and be completely puzzled (and since there’s no obvious relationship between rows of ducks and what you actually want to express, there’s no way they’re going to be able to make even an educated guess).
You’re overthinking it. Quite simply there are plenty of idioms that don’t exist in other languages, so you have to express the idea using plain, boring, ordinary sentences. For instance, I can’t think of any equivalent to something as trivial as “sitting on the fence”, either.
If you tell me that your paperwork is “bien rangé”, I’ll assume that you have made neat piles on your desk, not necessarily that you actually took care of it. "Ranger"really is about physically putting things in order. The most common use of the word is probably “range ta chambre!” that every parent barked at their children hundreds of times. There are some secondary uses of the verb, like “se ranger à son opinion”, “une personne rangée”, “se ranger des affaires”, but not relevant for this topic.
“Bien préparé” is much better : “j’ai bien préparé mon examen”, “je suis préparé à toute eventualité”, for instance.