I read your blog on Mooki and you do have a tough road to travel working with an abused bird but you have only had this bird for a short time, this will take much longer to overcome but it is possible.
Please do interact with him as much as you can, you don't have to handle him much until he comes to trust you some and you will have to earn that. Include him in conversations, read the paper or a magazine to him for it will take a long time for him to get over his fear of hands.
He might be in need of a vet visit if he hasn't had one in a while, just to be sure he is healthy.
I do not have any experience working with a bird that was abused but we do have members who have worked with them and maybe some of them will chime in with some advice for you but time and patience on your part will be your best friends for now.