Summarize the following:
You may use a sump pump, your filtration system or siphon hose.  through-the-wall(s), return(s), lights, etc. Replace as needed.  You can use a razor knife and cut into smaller pieces for easier removal. Repair as needed with a masonry sand.
Drain all water from pool. Remove all hung ladders from liner area and any other equipment that may obstruct liner area. Remove all face plates and gaskets from inside pool area, i.e. Inspect all face plates, gaskets and hardware for cracks/rips and/or wear. Remove seat clamps, pool ledges, top plates and top rail, basically the top end of pool. Remove old liner. Inspect pool base and cove for wash outs and evenness. Remove old duct tape from the wall bolt seam. Re-tape wall bolt seam with duct tape. Sweep entire pool area clear of pebbles, rocks, sharp edges and all debris.