Normally union Journeymen.
There was a movie about a ship being upside down and the bathroom was installed by union plumbers BUT the fixture were placed on the ceiling rather then on the floor for the special effects .
The only thing they forgot to do was the toilet paper was hanging wrong as people forgot about gravity
Do a Google search under swimming pool plumbing designs, or swimming pool plumbing (or pipe) layouts, or schematics... somewhere in the top ten will be a beautiful picture of what you want.
A plumbing job requires workers to clean the pipes of a home, as well as make basic repairs. You can find a job as a plumber after you complete a course and obtain a license.
plumbing requires a basic experience about taps and mechanical things
You can probably find the plumbing to step down to the right size but the pool pump will have more water flow then a garden hose can safely handle. Your going to ruin either the pump or yourself.
Check local plumbing codes as there is no such thing as basic. The water supply must be provided with an air gap to prevent the possibility of contamination of the potable water supply. The piping material must be able to hold the pressure and yet not be affected by chlorine The drain had to be protected from having a large vortex which can litterly suck a child down and drown them If there is lighting inside the pool special GFI's must be taken into consideration and the skimmer GPM flow rate has to be calculated by how many gallons the pool holds
For free information about do-it-yourself plumbing projects, go to completediyguide.com/plumbing. This site has free how-to plumbing project guides, and other plumbing information you may find useful for future DIY projects.
Jandy has a very nice plumbing schematic book. I did not find it available for download on their website so I did a google search and found an online pool retail store that has it. I've posted the link below. http://www.poolcenter.com/jandy_pool_plumbing_schematics_for_pools.htm
No but you do need to study about plumbing. You can find places where you learn imparticuarly about plumbing.
They don't make them for in ground.
Plumbing contractors who are unionized can be contacted by reaching out to the local plumbing union in your area or by checking on plumbing contractors in the white pages.
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The best sites are InGroundPoolDesign and MyDreamPool, where you can either research yourself, or talk to consultants and construction experts to find the best inground pool designs that suits your needs.