The alarm shouldn't go off actually. Unless there's a VCM issue, doing a hard reset has never set off the alarm for me. If it does, a quick push of the center button on the key fob will turn it off.
To do the hard reset, pop the hood then move around to the passenger side of the vehicle, right by the passenger side front tire. Look straight down, you'll see a large black connector directly above the tire. There may be a grey lock mechanism, which you can pull out with your fingers or a small flathead to pop loose. Once removing that, or if there isn't one, push down on the tab and pull the connector apart. It doesn't take a whole lot of force at all. Leave it disconnected for about 10 seconds, then plug it back in and turn the car on.
I advise leaving the key outside of the car during this, just in case. You'll need to re-calibrate the emergency brake (turn it on, then turn it back off). You may also need to re-cal each window as well if the auto-up doesn't work. If needed, to do this the door of the window you are calibrating must be closed. Roll the window all the way down. Hold the window down button for three seconds, then hold the window up button until the window is all the way up. Continue to hold it for another three seconds. Do each window one by one. If the auto-up feature works, then it's successfully calibrated.