Jigsaws are a waste of time IMO.
Cutting around sockets is best done on the wet sawwhith the guard removed and "plunge" the tile down (glazed side up).
Next way would be an angle grinder with good (Marcrist, Norton) wheel. Make sure the tile is held secure on a bench before attempting cutting and that your hands are dry. Let the wheel do the cutting and dont force it.
Makita make a small hand held tile cutter ideal for such a job but it has its limits being battery powered nd the water bottle feeder is prone to breakage and leaking. Some people love them and others hate them.
Which ever way you choose please be aware of safety.
Eye protection,
Ear Protection,
dust mask,
especially with the angle grinder
