you are going to eat "summer pricing" in purchasing a new pool. if you could wait till say fall, when prices drop to clear out inventory. pools can drop in half for the materials.
if you get a packaged deal for materials (sides, liners, filters, pump, and like) everything can be fairly simple to put together. but you also take a hard cut in what is used.
if the pool is going to be permanent setup. and say drained during winter. i would go over to
Koiphen.com and check out some folks "pond builds for koi" were they use bottom drains, and DIY filters. and different setups than pools. folks there tend to be heavy on the DIY ((if it can be done DIY style someone there on koiphen most likely has done it and posted a picture guide in how they did it)). and can save half the cost on many things in building a pond. granted pools are different in filter types. and how you maintain water. but it might be worth your time to look over things.
as far as above ground pool, make sure you get things level. and if you need to grade stuff out. only dig down as much as you need to and if possibly never beyond what you need to dig down. if you dig out more than what you need to avoid settling problems. make sure you compact everything good.
to be honest, i will not have a pool nor pond without a bottom drain on it. it creates extra work and costs a little more to setup correclty for easier maintance. but boy do they make things much easier to keep things clean. more so in ponds, but same thing for pools. and if this is going to be a temp setup thing during summers. you can get "retro bottom drains"
many times on
Koiphen.com folks will buy a cheap pool cut holes in sides and like.to run a retro drain, and a skimmer line. and a hole or like in liner for a return line or 2. put there fish in it. while they build or repair there pond. there be many threads there that show pictures and step by step guides to things. and what to and not to use in certain things.
i hate to say it, but pools and more so how some of these pools get setup and installed with small size piping and large huge costly run pumps, and the filter sizing can be to small and a pain to clean just for a pool. and for me, many times this runs into ponds for fish. due to pool companies tend to know pools and think ponds are same way; WRONG. and can destroy a pond or rather make a pond for fish a nightmare to maintain. on the larger size ponds, folks swim with there fish.
you have many options. if you have a tractor, and little extra cash to spend for a good long term pool. check out your options for DIY style setups. it might take longer to setup, but most folks given some time and willing to learn, even novices never done it before, i have seen create stuff that put folks in the business to shame.
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if the pool are for the kids while there young / teenage years. and you might only have pool for a couple years a cheap package deal might be worth it, for ease of setup and be done with it. but if you are looking for long term. and want to cut down your physical cost of operating it and maintaining it including maintenance / chore time to keep it clean. i would start looking away from packaged deals say from walmart and start looking at building a DIY pool from scratch and get into niddy griddy of things.