The caliper is bolted to a carrier that is bolted to a steering/suspension knuckle.
remove pads, do not let caliper hang from it's own weight and remove brake caliper mounting bolts-new ones need to be used for replacement- from the steering knuckle.
if equipped remove pad wear sensor wiring from clip under wheel arch
remove screw holding disc to hub.
try to remove all traces of old locking compound from bolt hole threads if possible.
replacemnet torque settings: brake disc screw 7 lbs/ft, caliper mounting bracket to steering knuckle 85 lbs/ft, caliper slide pin bolts 18 ft/lbs