Removing the panel and the old timer with knob was straight forward and we had done it before, but then we discovered while installing the new timer, the knob was broken, so had to order another knob today.
You might want to check the condition of your knob before ordering the new timer to make sure you do not need another one at the same time.
We are disabled senior citizens, and moving and maneuvering to get to things is a bit difficult for us. Should be a snap for an able bodied person.