Not for the faint of heart and will take much longer than the indicated time. In the end bring it to a professional, as the battery does NOT come off as indicated. I now have an even more expensive repair as the battery socket came off the motherboard.
Caution the connector may not be properly soldered onto the motherboard. For me it snapped off the pins and now have to find a place to get that fixed if even possible. may have bricked it.