Also, if your "power button is stuck", you may not have to replace the whole power cable. After you unscrew the power button bracket, you should see a small black dot in the center of the gold colored area (where the button makes contact). Usually, stuck power buttons mean that either this black dot has worn away or has been shifted/misaligned. If the black dot is misaligned, put it back in the center and test if this has solved the issue. If the black dot does not exist, find/cut a small piece of rubber and carefully glue it to the center of the gold area. I cut a small piece of rubber from a thin o-ring and then used a dab of superglue to attach the rubber. Another commenter used nailpolish instead of rubber to create enough height to contact the power button. After all of this, screw the power bracket back on and test the power button. If the power button does not click, it may be that you screwed the bracket on too tightly such that the button is always depressed. Loosen the bracket screws.
Another solution for this step is to carefully push the digitizer and screen ribbon cables down (into the back of the front screen) instead of bending them back. If you do this carefully, you can minimize how much the cables bend and still have enough clearance to angle a screwdriver in from the top to remove the rightmost screw.
This worked for me without damaging the cables. I did not have to remove the front screen either.