If for some reason you break your screen or other parts of your Galaxy Note 2 breaks such as USB port, microSD slot, etc, here’s how to disassemble and assemble your Galaxy Note 2.
Step 1. Take your back cover, SIM card, microSD card, battery, and S-Pen out. Then unscrew all the screws you see.
Step 2. Next use plastic phone prying tool to get between your screen and the frame.
Step 3. Slowly work your way so you have a small gap (1-2mm) between the screen and the frame.
Step 4. Take a very small flat screw driver and pry the center part near top of the battery compartment. Be gentle and it should pop out.
Step 5. You should be able to easily pull the frame out and screen should separate.
Step 6. If you are trying to replace the screen digitizer/glass, you can unplug all the connectors. There’s one black screw that holds the motherboard in place and one silver screw that holds the USB compartment at bottom.