We built our pool back in 2004. Above was my original design. Not too far away from how it eventually became.
I've just found the above 'work in progress' photo; looking back on past projects is always interesting. Time is such a great healer!
We did, of course, get proven professionals to dig the hole, build the pool itself, and lay all the poolside flagstones. The drawing (top) was what we gave him to work on. However, I rather stupidly offered to do all the finishing work myself; walls, roofs, flower bed surrounds, rendering, and planting. There was a lot to do.
Some tasks were essential. Originally there was no way down to the Pump House door (see middle pic), so a flight of steps had to be built. Nor did the Pump House have any door, roof, or exterior rendering, so all that had to be done. It also needed roof pinnacles which had to be commissioned and installed.
It's taken all of 13 years for us to be reasonably 99% satisfied with everything (one is never 100% satisfied).
In our pre-pool days we used to drive a couple of miles to a dirty nearby lake where we'd swim; but it became tiresome. The small investment in our own water filled hole was one of our better decisions.
Now, if you'll excuse me..... it's 33 C, and I have an appointment.