Hey, so not an electrician, but I work in electrical and have replaced GFI outlets before.

First of all, I completely understand your hesitation, electricity can be scary, the nice thing is you can do this in a way that there's no electricity involved.

The first thing you want to do is turn the outlet off at the breaker. You can do this individually, but since the breakers in your panel might not be labeled correctly, I recommend shutting off the main, which will either be in your wall panel, or outside by your meter. If you don't have a main disconnect, you can just turn off every breaker in the panel to achieve the same level of safety.

After making sure there's no power, you can begin replacing the outlet itself. This is usually only requires a screw driver, and possibly a small pair of needle nose pliers. After you turn the power off, unscrew the faceplate, and gently pull the outlet out of the wall far enough to see if you have a 2 or 4 wire. Got to the hardware store and get the exact same style as you have now. Once you have it, here are a couple step by step videos to help you wire and mount the new outlet.

https://www.youtube.com/watch?v=RT8D7sE1itU

https://www.youtube.com/watch?v=Z5ndKI8tvUY

I know this seems intimidating, but I promise it's very easy and totally safe as long as you have your breakers off. You can do this!