Replacing a defective fan is pretty easy and...
How to remove the earpads on the Bowers and Wilkins P5 headphones
The audio cable is easy to remove and first requires removing the earcups.
Teardown of the iPod shuffle 1st Generation
Replace the Heat Sink in your MacBook Pro 13" Retina Display Early 2015.
How to replace the circuit board to the radio.
Replace a broken rear case on your iPhone 3GS.
Remove or replace the SIM tray (including the SIM card) on your iPad Air LTE.
How to build a fire
How to remove and replace a worn out Moto X4 battery.