With a Phillips screw driver, on the back of the control panel there was about 6 or 7 screws to undo, to take the cover off and 2 screws holding the timer in place. Just undone those, took out old timer, made sure I took wires from old timer one at a time, and, put on new timer. Put everything back, although I had to find a couple of very small washers to make the timer fit tight, in the 2 holes it came out of. Luckily I had those or would of been a very loose timer. Very easy to do.