In terms of cage aggression (feeding mode), you don't have to actually lift the snake out of the cage with a hook (heavier snakes do need more support than a hook). Simply "hook train" your boa; before you lift him/her out for handling, gently pat his/her head with the end of a snake hook. This way, your snake will soon begin to associate the hook with handling, and will snap out of food mode when they notice the hook.