The iFlex or similar tool only needs to be inserted just enough to create a small gap between the glass and the display panel. If inserted too far, it may damage the front-facing camera.

Apply a suction handle to the center of the screen's top edge, as close to the edge as possible.

Insert the iFlex or similar tool at a downward angle in the notch between the top edge of the front glass and frame.

Use strong, steady force to pry up the glass with the suction handle while gently pushing the iFlex between the glass and the display panel.

The front glass will peel away from the display panel, causing it to appear discolored. This is normal. You will remove the display panel in a later step.