Although I have seen many Hedgehogs or 'Egels' as they are called in Holland where I grew up, as a kid, I was never armed with the wisdom of how to get one to uncurl into a more manageable shape, when you have one in your hands.
I just found out, by reading this review on a recent book on Hedgehogs, "A Prickly Affair" and knowing that many are caring about, or as in some cases caring for, hogs, I take it that you will add it to your Santa wish list or give it to like minded friends in the hope they read it soon, so you can read it too.
In that case you might want to give it before Christmas!