Hi my name isXXXXX can help you.
The f3 error code for a GE oven is an open or shorted oven sensor.
My husband is a do-it-yourselfer, Googles everything and is pretty good. Do you think he can just buy a sensor and Google it and do it himself or is it trickier?
Replacing the oven sensor is the repair for that code. Also check the wiring harness that connects the sensor to the control. In some situations a pinched and or bad wiring will cause that error code also.
No there isn't any trick for replacing the sensor, it is simple to do.
If I hire someone, about how much do you think it would be, typical house call and all?
Service call and labor 120-150
and the part 35-50