That's the one thing the books ARE really clear about: it's a very dangerous thing to try to do. People have gotten killed doing it. Not so much because they don't know how to change back, but because they get stuck between the two forms. Like how would you breathe if you got stuck between the lungs of a human and the gills of something that swam underwater? Or they die when they make a mistake by changing wildly into a form that doesn't really exist. Or they WANT to be one kind of animal, like, say, a lion and try to change into that, but their real animagus form is something more like a mole or a mouse.
One of the worst books had pictures of what was left when some of those people died. But that book was mostly about Dark Arts stuff (REALLY creepy stuff--like how to use the parts from the bodies of people who died from failed Animagus transformations in POTIONS. Ugh.).
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One of the worst books had pictures of what was left when some of those people died. But that book was mostly about Dark Arts stuff (REALLY creepy stuff--like how to use the parts from the bodies of people who died from failed Animagus transformations in POTIONS. Ugh.).