Almost Defective Start push button

[Flavia]

This start button is almost Kaput
It looks as if I have to replace it with a new one from Cox’s Motors
Is this difficult to remove  etc and will the New one require reprograming
My Jazz is a 66 plate Ex CVT.
I would really appreciate any advice so that I know were to start.
I suspect this is going to be a nightmare for me.
Thank you in advance.
Flavia.