You have to remove the metal frame first. The metal frame is held on the LCD panel with 1 screw on the front and metal clips around the panel that hook into the backpanel of the LCD. Have a look at the sides of the frame and you'll see what I mean.

You have to straighten the metal clips/hooks from the frame so you can take it off. Then gently lift the plastic LCD panel out of the housing.

Avoid touching it at the back and repair it in a dust free environment. Let's say clear all the dust first before working on the panel as we don't have a dust free clean room at home