I saved money where I could, e.g. bought the Pentair components off the net (big savings), I did the electrical work, prep and sod laying, etc. I kept all receipts and invoices throughout process. I "thought" I could get this done for $35K. But, I decided to NOT cut corners and go all out with the concrete, sidewalks, additional patio off sunroom, etc. Ended up pouring 25 yards of concrete. During the planning phase I changed and added concrete 3 times. I just kept telling myself that if I was going to do it, NOW was the time to do it. About the most common regret I've read on this site from home owners is NOT building enough patio/concrete. So, while I was being frugal, I was driven more by not wanting regrets at the end of the install. Hidden costs to beware of are in things as simple as backfill...some builders go with sand or 57 gravel (both are inexpensive). My PB insisted on #8 gravel. It took 60 tons of gravel. Gravel cost direct from quarry was $3k. I don't have regrets... I still have to install a fence (bought a used Jerico 48", black aluminum off Craigslist). When the fence is installed, I'll be right at $48K TOTAL.
I read many posts about FB pools having spider cracks, minor flaws, etc. When I received the pool I couldn't find anything wrong. And, after install, I still have zero issues with the pool. In hindsight, I go with the very same pool again, no reservations.