Actually it is not as dramatic as that!!
The Autorotation it self is explained good enough, but the end of it?
What we do when we practice engine failures, we lower the collective all the way, and use it to maintain the rotor RPM at a proper rate. A little up on the collective will slow it down some, all the way down and doing brisk turns will bring the rotor RPM up a little.
At the bottom (50 to 100 feet above your selected landing area) you start a flare by gently pulling back on the cyclic stick (in your right hand). This will slow down you speed and your rate of descent, and increase the rotor RPM to the maximum recommended (red line). When the aircraft is slowed down sufficiently, you again push the cyclic forward and let the aircraft settle towards the ground, just before it touches, you will pull up on the collective sufficiently to slow down to a smooth landing.
In flight schools we do this to the ground almost every day, and it does not have any detrimental effect on the aircraft. Actually, sometimes an autorotational landing can be smoother than a regular landing!
In real life, the outcome of the landing is usually dependent on the reaction time of the pilot, and the landing area he chooses, but in general, if chance favours our "hapless pilot", he or she should be perfectly able to set the machine down, without damaging the aircraft or hurting the passengers or crew.
Hope that helps!
(Oh, I'm a helicopter pilot/Instructor pilot)