__ hrs Digging
__ hrs pool frame construction
__ hrs bottom prep (including __ hrs for custom cove molding)
__ hrs liner preparation
__ hrs filling

I will try to answer these for what it took on my pool (a little larger than above at 30 feet diameter)
First off, I was quoted 2600.00 - 3000.00 to install the pool by several builders, that's what turned me off hiring someone.

Digging - had a neigbour w. front end loader move a large clay pile I had on another part of my property into the spot for the pool since I needed to raise my grade about 1 foot for a future deck to meet up level from where it will start. This was done sept the year prior so it could settle over the winter.
First thing in the spring, I ran the electrical, this was a pretty long job because unfortunately, my electrical panel is at the complete opposite side of my house from the pool, I had to run through 70 feet of the house, 60 through the garage (down 2 walls), and another 100 to get to the pool (yeah, it's just a little removed from the house), from plug one, I ran it another 60 feet to get a second outlet directly opposite. Used a ditching machine for the outdoor runs, worked extremely well.
Another neighbour (bobcat service) levelled the spot and brought in screenings and sand for about $200 at time of build.
Screenings were for walls to sit on and the sand for inside the pool - I had my pool dipped to the middle by 8" deeper.
Leveling took about 2 hours with bobcat, another 3 with a rake and transum getting the screenings level and compacted using a rented gaspowered vibratory compactor.
Wall went up in about 4 hours with frame - 400 lb roll of steel - not easy to move. frame on my pool was super simple, not many screws at all - if it was a different pool, I would guess 3 times that time due to the size.
Leveling sand and building cove from sand was another 4 hours. Raking wasn't the easiest since I tried to keep things relatively uniform.
Liner prep - maybe 2 hours to get it perfect - once again, not too easy because of immense size.
Filling - 6 hours, only because it took 5x4000 gallon trucks, each trip being a one hour return trip.
All other associated work like plumbing/lighting was another half day
So far, worth every cent, we've had it 3 years now, not a problem yet, got some solar panels last year and a custom roller for the solar blanket