It’s one thing knowing how to change a light bulb yourself, it’s another trying to rewire your home. There are some jobs, no matter how simple they may seem, which can only be fixed by a professionally qualified personnel. You wouldn’t take your child to your neighbour and ask them to perform open heart surgery is they a music teacher. You wouldn’t ask a scientist of nuclear physics to redo the filling in your teeth either. Why then, would you attempt to rewire your home if you don’t understand how the wires connect or if anything needs replacing?
You may think you’re saving yourself pennies and time but the reality can be very different.