Is there a DIY for replacing an alternator?

[Shinare]

Just as an update, I brought the battery to Autozone, they tested and it failed. I purchased a "Duralast Gold" battery for $107 after being reassured that it would fit. It didn't fit in the bracket without prying down on the bracket on the battery itself but eventually it closed enough to allow me to tighten the nut enough to stay on. I hope it lasts. I could tell immediately with the first crank the difference in batteries, the other battery always sounded a little sluggish cranking the engine, now it sounds like the starter itself could propel me down the road at 30MPH. Zero hesitation.