I've had my dwarf hamster two weeks now and I'd just say patience and persistence is key. I do at least two 10 minute taming sessions per day of just putting my hand in and quietly talking. I mostly feed by hand too. My little one will now happily sit in my hand even if there is no food in there. Granted, she's got there much quicker than I expected but I think try and let the hamster lead the taming. I can tell when mine has had enough and it's time to stop and try again later. Little and often! Have you had a dwarf before? They're rather skittish compared to Syrians in my experience but totally worth it in the long run!
