Skimmer replacement

Any installation tips on replacing my above ground wide skimmer which has cracks in it? The liner was replaced 3 years ago but they used the old skimmer which was 10 year old. The water level is 2 inches below the skimmer. I’m just worried about the liner shifting during replacment. Any help would be appreciated. Thanks, Scott

The liner won’t shift. There is too much weight from the water. You can see the installation of a skimmer in the video below.