Wiring is a difficult business, and a professional electrician should be consulted anytime you’re dealing with anything more complicated than plugging something into the wall outlet. Electricity can be dangerous in the wrong hands, and without proper training and licensing, any attempt to work on your wiring could start far more trouble than it solves. If you have any kind of lighting issue in your home, you should always call in a professional service.
That principle applies to smaller issues as well as larger ones. For example, you might have wires or cables running along the floors to your home for a home entertainment service or a similar set-up that involves a lot of appliances. Those wires can be very unsightly at best and an active source of trouble at worst. A professional electrician can hide those unsightly wires and keep your home running the way it should.