Serpentine belt replacement

Hi all,

While driving today, my battery light came on and shortly after the high engine temperature light came on. Thankfully I was within feet of my house and was able to get into the driveway when the radiator exploded/leaked. The serpentine belt has snapped (or whichever belt is the one that's connected to the alternator). Is this a reasonable fix for a beginner do-it-yourself person? I could easily go to an auto part store and get a replacement, but was concerned about whether I'd be able to "un-tension" the relevant gears, etc, to be able to fit a new belt. I assume I would have to also consult a diagram to see the orientation and order of how the belt wraps around the engine/alternator/compressor. Please let me know if there's anything else I should know. Thanks in advance.