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By nature, two-prong outlets aren't grounded—but the box they run to might be, which makes them safer. The safest way to test if an outlet is grounded is to purchase a circuit tester, which cost about $20 at home improvement stores. 

If you discover your outlet (or outlets) aren't grounded, know that this greatly increases your risk of personal injury and electrical fires. You may want to consider installing new three-prong ground fault circuit interrupter (GFCI) outlets. On average, the cost to install GFCI outlets is about $210 per outlet.

Do not touch electrical wires in your home without first turning off the power at your circuit breaker and testing the wire with a voltage meter or multimeter. Electricity still flows through wires even when a light switch is powered off, and touching wires with the switch on can result in electrical shock.

This depends on how many outlets you have and the current status of your electrical system. The cost to ground an outlet clocks in at $75 to $480 per outlet, so multiply that by the number of outlets in your home to arrive at a rough estimate. However, this is for simple projects with no obvious issues with the system. Your final bill could vary widely from your calculations.

Most household circuits can handle about 70 strings of 50 standard mini lights, or up to 600 strings of LED lights, which consume less power than the incandescent variety. Make sure to factor in any appliances also running on the circuit.