This guide is incomplete. You will require a soldering pencil to reattach the new keyboard to its metal backing plate and the laptop faceplate. It could also be useful in releasing the old keyboard from the backing plate and faceplate. if you are slow and cautious it will probably take you 90 to 120 minutes to complete. 40 minutes is only if you have done this type of keyboard before.

Also read the comments regarding the access bay screws that need to be removed during disassembly and remember to remove the sata drive as well.

Remove the TWO recessed screws above the RAM and the one screw below and to the right of the large button battery.

Then you need to remove the SATA Laptop Hard Drive or SSD on the left by removing its 4 screws and gently pulling it all the way left before lifting.