Turned off the gas then disconnected the gas line. Unplugged the AC cord and removed the unit from the counter top. Had to locate a suitable area to lay the cooktop, rather large. The bottom cover is held on by 6-8 sheet metal screws, however, the gas regulator and nipple must be removed also for the cover to come off. I removed the Igniter module screws, leaving the wires connected and mounted the new module in it's place. I then removed one wire at a time from the old and put it on the new part. Replaced the back cover and reinstalled the gas regulator with fresh pipe sealant. Probably took an hour including cleaning the top and counter top.