As you may know I am having to jack hammer up part of my deck to replace the skimmer and run a new suction side line, while I am at it I want to install an additional eyeball return fitting a few feet down from the skimmer location (same general excavation area) and I am wondering if this is possible without draining the water and removal of the liner. I am going to get the same model of skimmer as the existing one so with luck the old faceplate and associated hardware can stay attached and only the back and attachment gasket will need to be changed. So my questions are can this be done, can it be done as advanced DIY project, and is there any particular brand or type of return fitting that would make it easiest.
p.s. the pool is a 30+ year old wood frame vinyl pool and the current liner while still in good shape is 6 or 7 years old now.