They are indeed a challenging hunt just from the fitness level. Also require long range flat shooting rifles. They live high on the rocky bluffs and are extremely wary being blessed with exceptional sight. They can just fair motor up cliffs with their specially adapted feet. One of the considerations taken into account before shooting a Thar is if it will be recoverable from where it may fall.
Some guides carry ropes etc.
A lot of thar are shot by hunters out of helicopters hovering above them. I often ask myself how an obviously unfit hunter photographed at 8,000 feet in heavy snow wearing blue jeans, no balaclava, and new down jacket can claim such a fine trophy. Regardless of that a number of guides do run good successful wild Thar hunts. The Austrian Chamois has totally colonized the mountains of the South Island and although heavily hunted by sportsman they continue to thrive. They are found from the far south of the island right up into the Northern Marlborough region of the South Island.