I have cut the gasket into two pieces and trimmed the lip CAREFULLY with a utility knife. Cleaned up nicely. I did NOT cut my liner prior to securing the skimmer gaskets and lip. I used an ice pick(or awl) to poke the holes through the liner once I had everything in position, as the screws are not self-tapping. Once I had all screws started and about two-thirds down, I cut the liner in the middle of the skimmer opening. Kept tightening the screws and trimming the liner until they were tight and the liner was trimmed away. It was actually easier than I anticipated. Hope this helps!
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