The twirling of the lariat is the hardest part to master, because many people have a hard time learning how to make the twirl happen with their wrist. Move only your wrist, not your whole arm. Think of your wrist as an axle, as if the rope was a wheel revolving around your wrist.
Aushwitz killed over a million people by the end of WW2, and was one of the worst camps to be sent to during the war. The pure evilness of that went into these killings was shocking, and children were often subjected to the worse of these tortures because they could not defend themselves.
There are a few reasons Auschwitz has the fame it does. It was the biggest of the camps, and it also killed more people than any one camp. However, it killed proportionately less people than some of the other camps. Timothy Snyder makes the case that Treblinka was actually more efficient as a death camp.