The next two videos are part one and two of a segment called 'Dirty Jobs' which has a presenter called Mike Rowe doing different jobs that people write into the show about. This one was working on an alpaca farm. The majority of the videos is about the shearing but they do go into other details as well such as teeth, mating, spitting etc. Its reasonably informative and has good close up of the shearing. Just a small correction - they state that alpacas have a 4 chambered stomach when in fact they have 3 chambers.
The restraint system used here is a table with restraints for the legs and a belly strap. You get to see more detail of the table when they shear the camera man in part two.
The next video shows shearing done on the ground with foot restraints.