I haven't used Western Union recently, but from what I remember, collecting money is pretty straightforward. You'll need a government-issued ID and the transaction's tracking number (MTCN) the sender gets when they send the money. As for collecting at a post office, it depends on the services offered at your local post office. Some do allow Western Union collections, but it's best to check with them directly or look it up online for your specific location. Hope this helps!