Testing home receptacle...Help plz

[JJSmitches]

I had an electrical problem today at the home. The wife was using the vac when it stopped working along with the lights in a portion of the house. We checked the circuit breaker and non looked to be tripped. So we reset all of the breakers for lights+plugs.

I talked to my local Lowes guy and he suggested testing the receptacle. When I tested for voltage I got nothing. I then followed the directions for testing the "live side" and both sides show live.

I also had one of those plug-in receptacle testers that has 3 lights to show if the thing is wired correctly and it showed that it had the ground and hot reversed.

The receptacle had worked fine the last 4 years and now this.

Any tips?
Should I turn off the breaker for that house and call an electrician or could this be an easy DIY fix?

Thanks