SMILE is the key?

Do you remember your first day at work?
I have found that first day in a new job is always hard and wrecks my nerves. It was always difficult and not easy to go through. The place is different, the people are different, the systems are different; just how to cope with it comfortably? No matter how many times I have started work at a new place, the feeling of nervousness will just come. So many questions come to my mind: What to say to people? How to greet them? Am I welcome there? Am I going t...