Hi. This site has taught me so much. So thanks for all the info I've gotten already. I'm about to set my Intex ultra frame 16x48 up the right way finally. I've gotten my intex 2650 sand filter, swg, and a Hayward through the wall skimmer. My question about the skimmer is this: when I install the skimmer, should the pool be empty, partially filled, or full? I have no hangups on cutting the liner at all, just the fear of the liner stretching if I do it incorrectly.