These intra-operative photos aren't for everybody, but most people find the presentation fascinating. Click on one of the three operations below. Each of these three operations is a book, whose chapters you will see when you click on the link. The chapters don't have to be read in order, but it helps. A checkbox that allows you to turn the image cloaking option on or off appears at the bottom of every tutorial page.
Most people do just fine.
More on image cloaking can be found here. Just put your email address in the box below and click the button.