I would propose a "what do 4 friends in a pub / cafe / etc" say test.
Imagine asking your question in a social setting to a group of locals, and see what they say.
If they all universally reply with something that leads to a situation like:
You - I just can't figure out how to do X
Them - Just use/show your Flobber
You - What's a Flobber?
Them - You know, that thing you got when you were 16 and have used ever since?
You - reads the wikipedia page
You - I still don't know what a Flobber is, nor how I would get one, and I'm fairly sure I've never heard of it before this moment...
Them - But surely everyone in the world has a Flobber?
You - I'm willing to be the cost of the next round of drinks that they really really don't...
In that situation, it's a great fit for here!
You - I can't figure out how to do X
Friend 1 - Hmm, that's a tough one
Friend 2 - Can you even do that?
Friend 3 - Do you know Dave? He did it last year, it wasn't easy
Friend 4 - I think they run courses on that in the library, it catches everyone out
Friend 1 - Budget a month for that...
In that situation, it seems it's a common problem for locals too, and there's nothing special about being an ex-pat, so it isn't on topic here.
I'd say that if between 2 and 4 of your group of 4 questioned give the same "it's easy with this thing you've never heard of" answer, it's a good fit for here. If 2 or more people say it's hard for them, probably not expat specific and belongs elsewhere