Yeah.. You essentially add each other on the 3DS, and then one of you goes to the other's town, and you do your trade
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
.. Obviously there is some degree of trust involved.. Which is why some people prefer trades done in their own town for safety.. But 99% of people here are trustworthy