What are the step-by-step installation instructions for the Honeywell RTH7600D?

First, turn off power to your HVAC system at the circuit breaker and remove your old thermostat, photographing the wiring connections and labeling each wire. Next, mount the new thermostat's wall plate using the provided hardware, connect the labeled wires to the corresponding terminals, attach the faceplate, and install batteries according to the quick install guide. Finally, program your schedule by pressing the Schedule button, selecting your desired days, and adjusting time and temperature for each period (Wake, Leave, Return, Sleep).