it will hurt
You will feel pain.
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glossopharyngeal nerve (IX)
Hitting a nerve while drawing blood can cause nerve damage to the patient. This is very serious and can result in a permanent disability.
hypoglossal nerve
hypoglossal
Yes, but most likely only one side, as the trigeminal nerve and/or facial nerve do affect the sensations in the tongue.
Tongue
You get shocked, but not through your heart, so it won't be pleasant, but it won't kill you.
Finger tip has numerous nerve endings and that's why they are too sensitive. Similar is the case with tongue which has numerous nerves in order to propagate the taste sensation from the taste buds on the tongue
Cranial nerve 9: glossopharyngeal
Nothing, but it hurts like hell just like if they miss the vein and hit a nerve.