DONT get a snake hook for a Blood
Their bodies just arent made for hooks, and they really dont like them in general. As adults, you'll start breaking ribs and causing damage with a hook. Bloods like to feel "safe" when being held, a hook doesnt provide that.
Get over the fear and get him used to it at the same time
It sounds like TYPICAL behavior
They are always going to have their "off" days and they will be a bit more flighty on them days, but its never anything that cant be overcome with slow steady movements.
Also, MOST of them DONT LIKE their heads or tails being touched.