About the only thing you can really mess up is the water heater. First, I would recommend you change the anode rod. Extremely easy job. But most importantly, do not switch the water heater on without having filled it with water first. Just turn on a hot water faucet until it stops spitting air. If you fail to do this, you will burn out your heating element in about a milisecond. Enjoy your TM...they are a hoot!
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