The biggest danger of DIY Electrical work is the simple fact that electricity is deadly and when not handled properly, the consequences are irreversible.
A lot of DIY electrical home improvement projects are often done while you’re in a hurry and without a proper plan. Something as seemingly small and straightforward as forgetting to turn off the electrical breaker, using the wrong tools for the project or even just touching the wrong wire by accident can send extremely high voltage coursing through your body - at the least causing major burns and at worse causing heart attack and death.
A lot of people feel like because flipping a light switch on and off is so simple, that we forget how truly dangerous and powerful electricity is. Most DIYers will only experiment with the breaker, testing different electrical circuits until they see the lights turn off in the area they intend to work in and assume it’s safe to start working. This "method" is a huge mistake because it is not always true that all outlets and fixtures in one area will be on the same circuit.
It is imperative to use a licensed electrician for your home’s electrical work. They will be well versed and licensed in all of the safety and building codes required to be sure the job is safely and correctly done. It is also critical to adhere to all safety and building codes should you ever intend on selling your home or having it inspected. DIY Electrical work can cause you to instantly fail an inspection, costing you a lot more money down the line to have the work repaired.
DIY Electrical work puts you and your family at the real risk of electrical fires, electrical shocks, injury or death that can be caused by even the tiniest mistake.