i used to be a cashier at my previous job.. then i realized that job wasnt for me.. i hated greeting people.. but it really helped me a lot at making eye contact. as far as smiling.. lol that's going to take a lot of work. I always only smile if i have a definite reason to smile (someone i know, something funny, someone talking to me, etc.). as far as if someone one on the streets looks at me and we lock eyes, it stays like that for a second or 2.. then i just look away. everytime i think to smile, i automatically think they'll think im creepy.