I bought this to replace an older Honeywell ST9160B1068 control board. The instructions were busy but once I figured out which section to follow (based on the board model I was replacing) it was very simple. It was a pretty simple effort of moving one wire (or connector) from the old board to the corresponding pin on the new board. The new Honeywell board also comes with 3 different wire-conversion pigtail connectors depending on which board and HVAC unit you are using. My particular board required the jumper pigtail connector that came with the new board (with very simple instructions saying "if you are replacing board model #### then you need to use adapter ####"). The total amount of time to swap out the boards was about 30 minutes. Luckily, our HVAC/furnace unit is easily accessed through a closet and the control board is right in front (not buried behind other components.)