The YouTube video made every step seem really easy, but most were much harder. And then, instead of replacing with a new battery with new parts, the video just put the relived battery and parts back in. This really understand how delicate many of the parts were.
Even following every step, the new battery didn't work for me and I had to buy a new phone. Perhaps I broke one of the wires.
In reality, this is not a replacement I would recommend to anyone who isn't a professional. It's a ton of steps and there are many possible places whether a mistake will brick your phone. Don't bother.
If I truly knew how difficult this would be to get right, I wouldn't have purchased.