Qualifier: I have not actually been inside my laptop case yet to do this but judging from the photo in the next step (43) where the cable is being pulled out and the “release position” of the lock is flipped up in that photo…..I’d suggest the two photos in this step (42) should be reversed if one reads from left to right and assumes the photo on the left and what it represents is a step preceding the photo after it. It appears the first photo (left photo) shows the unlocked position with the locking mechanism “flipped into the UP position”. The second photo shows the cable holder in the locked position. Trying to remove (pull) the cable with the lock flipped down may result in a bad ending.
REQUIRED PARTS (SCREWS) TO DO THIS JOB UNAVAILABLE HERE:
If your keyboard is riveted to the chassis as mine is, Late 2013 MBP 13” retina, you need about 100 screws to reattach the new keyboard.
ifixit does not have them. I did just now find them at Beetstech for $4.50 along with a back light $13 for the keyboard in case you want one. It looks like Beetstech is a big competitor of ifixit with an excellent reputation (like ifixit has) too. I just ordered these parts and will not happily be moving forward with my keyboard replacement.