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If you strictly adhere to electrical safety rules, including assuming that a circuit is hot until proven otherwise, and have some knowledge of how an electrical circuit works, you can likely replace a light switch by yourself without too much trouble. However, it's always advisable to call a nearby electrical pro to do the job if you're unsure of any steps necessary to change a light switch. 

Yes, a whole-house surge protector needs a designated breaker in your electrical panel. You will need to choose a double pole breaker that has two wire terminals so that your surge protector can connect to the breaker. This breaker needs two breaker slots inside of your panel. If you do not have room, then you will either need to adjust some of the existing breakers in the panel box or hire an electrician to install a subpanel.

If you’re outlet isn’t working but the breaker isn’t tripped , that could mean a number of things. First, check if it’s a GFCI outlet, which has added protection so your breakers don’t malfunction. If that’s the case, simply hit the outlet's reset button and see if it works. If it doesn’t, or you don’t have a GFCI outlet, you might have a loose outlet or loose wiring, a damaged breaker, or an overloaded circuit, which would require a dedicated breaker. It’s best to consult with an electrician to diagnose the problem accurately.

There is no blanket figure for a residential home’s electrical load, since load varies by the size of the home, how many appliances are used, and the efficiency of their electrical systems. Typically, however, it’s safe to assume 40 to 60 amps is the average electrical load of a residential home.