unplug the power cable. it should be attached just by pushing , so just lift it.

unplug the screen cable. they are ZIF connectors.

you can test the new screen here, just by plugging the new screen cable, then the power cable

unplug the button cable, also ZIFs.

remove the battery using a hard rubber spatula.(it's got handle like IPhone's, but with china quality)

pry from the left bottom side. NEVER from the right side, or you might damage a cable.

remove the remaining glue from the battery, and re-tape it inside the white lines with tapes like TESA 2mm.

unplug antenna wire running down right side of phone to bottom mainboard.