I've always done the shirt trick or a variation on it. I take a strip of cloth wash it with my laundry and wear it around my neck or head (looks silly so only around the house) for a few days and then place that in around the hides. I usually cut it in two a bit for each hide. They have their own personalities mine do for sure. The big thing is you can't rush them go so and easy. Move slowly around him and try just touching his sides not taking out just touching for a few moments than leave him along for a week or so let the snake let you know when it is ok with that then try to pick him up slowly. The head shy thing isn't a big deal some are and always will be and some aren't. Of my two one is and one isn't at all. Neither like fast moving shadows over their heads however. go slow keep away from the head.