i did both, service request and infopass. Infopass; must bring ID, your country passport, prepare yourself what you are gonna be asking, dress properly and just ask normal and confident like any other civilian looking for information. Oh dont wear too much jewel, or any metal. The security is very strict getting into immigration building. it's like going into an international airport...Nothing out of the ordinary. Sometimes our fears are greater than the actual events we face in life. I am not gonna lie to you i was really nervous... Good luck!!