Pry off the back and separate it from the front of the phone case. You should see the battery once you pry the back off.
(rewriting the second sentence)
You will see the battery once the cover is removed.
Replace backing of phone, pressing gently to secure to back of phone case ( There seems to be a bit of repetition in this sentence so I rewrote it.)
Reattach the back cover by pressing gently until cover is secure.
On both sides of the battery, there is a lighter grey half-circle. This is the best place to use your fingers to gently lift the battery free of the housing. Set aside the old battery, then replace it with the new battery. It should easily fit into place.
(deleted "it sits in") from second sentence
Attach the ribbon cable to the new hard drive and follow steps 1-3, in reverse, to complete the installation.
Carefully, pry the ribbon away from the pins.
You can use a spudger (tool shown in photo) to remove the ribbon cable from the hard drive.
Next, you will remove the mounting frame and the plastic shield.
First, you will need to remove the five T8 torx screws that mount the hard drive to the internal frame.
After completing the initial disassembly, you may proceed to hard drive replacement.