You don't use the hook to pick the snake up. You use the hook to gently rub or 'tap' the snake before you use your hands to pick it up. You can also use a paper towel roll.
Doing this consistently before you handle or do anything in the cage will switch off the feeding/defensive response and condition the snake to realise that you're not a threat or dinner.
You shouldn't pick a snake up with just a hook as it can damage the spine.
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