Always replace calipers in pairs. Loosen lug nuts, raise vehicle, and remove wheels. Disconnect 
Brake Line from caliper and plug it. Remove caliper mounting bolts and detach caliper. Install new caliper, replace sealing washers, tighten bolts, and bleed brake system. Reinstall wheels, lower vehicle, and tighten lug nuts. Repeat for rear calipers, including detaching parking brake cable.