You can't really get scammed by physical WU transfers, unless he has ties behind the chains.
I know you are being very cautious, but in order to send money (in person) you have to physically be there at an affiliate ie, if you were sending money from here to Poland, you'd have to go to Wal-marts or Drug stores in the USA and personally hand cash over to obtain the transaction info and the jazz.
Unless you were handing over counterfeits, that's another story as well.
Now online WU transfers are another story, I have never dealt with that and would still prefer the original method I am accustomed to.
Edit: and yes, that's how you receive the money. Any WU affiliate will ask you for your ID, transaction info, and you're done.