Aww! He sounds like my Syrian hammie, Mariposa, when we first got her! She was shakey and shy and very very afraid.. but she never really bit us and seemed like she was very careful haha..
We left her alone to get used to her cage and environment (for a week we didnt touch her). I didnt wanna stress her out.. Hamsters need to be familiar and comfortable to their new home
The 2nd week of owning her, I decided to start interacting with her.. she NEVER took food from my hands... had to build a little more trust before she ate from my hands... so for Humphrey to be eating from your hands, sounds like a good start in my opinion!!
I would say keep feeding him, keep interacting with him.. also keep talking to him... He needs to get used to your voice and scent..
That's another thing! They depend on smell and hearing... so just fluff around the bedding in the cage so your scent is all over and Humphrey gets used to your scent!
For handling, it took me about 4 weeks til I was able to hold her.. well tbh it was forced love xD which I dont really recommend but I was so impatient, I just wanted to love her already! xD
The first time I scooped her up (do not just grab him.. scoop him from under with both hands) she was shakey and frantic and I felt like her body shivered with anxiety... but I just kept petting her and talking to her..
I did this everyday for a whole week, and our holding sessions lasted about 5-10min.. I just did this just so she can get familiar with my smell and voice..
And I only held her when I knew she was awake and not eating (basically not busy).
During our bonding sessions, I would be with her in a play pen I made out of cardboard... so it would just be me and her!
Im still taming her.. but every week we had progress.. it's week 6 and just last night she was comfortable with me, staying still and not shaking anymore, and also coming to me whenever she sees me go near her cage!!
She used to run from me in the play pen
but not we dont need the play pen because she wont run away from me... she'll stay near me and do funny things like push her body against my butt (idk why she likes it back there lol...)
Hope my experience in taming helps you!!!!