I have an LG Enlighten (Straight talk Optimus Q) and i dropped a mug on it and the screen cracked. Half the screen turned black but was still responsive to touch, so I ordered a replacement screen and have been lucky guessing where my instagram post button is in the corner etc, and peeking at text messages on the bottom of my screen lol. But my screen got here today and I realized I have NO IDEA how to take this screen off? Or put this on? Help please! 