• Electrical circuits that become overloaded pose a threat of fire. 
• The right wiring size is vital in protecting electronics supplying the right amount of power. 
• Should switches, outlets or fixtures not be installed correctly there is a higher potential for fire as a result of excessive heat build up.
• Any projects that involve an open main panel increase the risk of exposure to high electrical voltage. 
• It’s critical to make sure that the circuit breakers are matched accurately to the circuit of wiring, something most do-it-yourselfers do not have an understanding of. 

One aspect that a great many do not consider concerning plugging devices such as computers and video games into a receptacle is that there’s only a certain amount of electricity that the outlet can handle.  Should excessive power go through the line it increases the chance for damaging the electric circuits of the device as well as raising the risk of fire. Just as important as proper wattage are the wire connections, should a wire not be properly fastened and tightened it triggers resistance.  This resistance causes heat from the electrical circuit which in turn can result in an electrical fire.  Electricians like this one understand the dangers involving adding new circuit breakers.  This requires opening the main panel and exposing live electricity in order to connect the new breakers.  The slightest mistake can cause serious injury and even death. 
It’s important to remember that the amount of electricity that can travel through a certain gauge of wire and also the right circuit breaker size is a balancing act. Ideally, too much electricity traveling this path would result in the breaker to ‘trip’ or shut down. However, somebody who tackles this as a do-it-yourself project may very well do something so that more electricity than is safe is permitted to flow without interruption.  This is a definite hazard that can cause a potential fire hazard. 
Even though it may seem like a cost effective idea to perform electrical repairs and alterations to the home yourself, keep in mind that cutting corners in order to save a few dollars is not worth the potential issues and dangers these shortcuts could quite possibly cause you later on.