I went today, everything went smooth ..very fast...just take ur birth certificate, and the work permit. Also matricula or passport just in case. they just put ur info into the system ask like 3 or 4 basic questions after they give u a paper saying in two weeks ull get the ss if not jist lets is know. I say just go, I mean if they are not ready meaning if ur info its not avaliable just go back another day. Good luck.