This guide makes things more difficult than they should be. After step removing screen forget messing with battery or removing MB, just loose or remove the lowest MB screw post and next few upward screws(closest to the bottom speaker) so the small tab of the speaker can come out from under MB, once you remove other screws holding speaker in place (start by taking out speaker from the bottom first GENTLY while pulling downward at the same time).
After speaker is out you can start taking out rest of the screws holding charging port/headphone/bottom mic cable. Pay attention to position of metal clips and brackets under screws their position matters (take nice pic beforehand so you can reference from it). After screws are out take some care removing cable and installing new one.
Always take care working with antistatic protection though especially in dry environment and pay attention to how flimsy some of the cables are so be GENTLE and take care not making sudden movements;) (had to do this to fix bottom mic)
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