If you have ate before you go near you hamster they may smell the food on your fingers and decide to bite you/nibble (Happened to me once so always wash your hands REALLY WELL) especially chicken. You can put the food on your palm and the hamster will climb on your hands to get the food. There are plenty of videos and websites that help you tame your hamster!
Once your hamster allows you to hold them you can start putting them with you in a bath/playpen with toys! there is a couple videos on that.
Hope it helps and good luck on taming!