Plan A:
Find a spark who knows how to do it and is prepared to turn up and do it.
Plan B:
Get a multimeter & learn how to use it.
Learn how 3-way light switching works.
DIY.
Find a spark who knows how to do it and is prepared to turn up and do it.
Plan B:
Get a multimeter & learn how to use it.
Learn how 3-way light switching works.
DIY.