Properly place the piece onto the "jamonera" (ham support/board); the only condition to be met by this device is that it provides a sturdy fixation for the ham and comfort for the cutter.
Ibérico Showcase
A cutting board and two types of knives are needed: a “jamonero” type longer one with a narrow and flexible blade for cutting the ham, and another “machete” type shorter one with a wide and short blade for cleaning the ham.