I've seen all standards for every location in the world. So unless they are dicks, it should be straight forward. Maybe a line-up would make it take a little longer?
If I buy with WU I do it online...it was pretty easy once I had everything entered.
When I pick it up I go to the store and pick it up.
It's usually pretty fast, unless there is a line or they need to find a register that has enough money in it.
I had some problems with verification this evening, using it online.
Also, unfortunately for me, my nearest agent is over two hours away, from what I know. It's also located in quite a dodgy place, in an area that I don't know very well.
Another alternative to WU is Walmart Money Transfer for those who have close access to a Walmart (I don't, so it's out for me, but I can send money that way too)
There's no verification set up needed, just enter credit card and residence information and good to go.