Project-manage specialists
You coordinate qualified trades rather than buying a turnkey contract.
A homeowner can take on different levels of project management or practical work, but a permanent inground pool combines excavation, structure, waterproofing, hydraulics, treatment, heating and electrical systems. Treat self-build as a responsibility decision, not simply a way to remove specialists from the project.
You coordinate qualified trades rather than buying a turnkey contract.
Some non-specialist tasks may be separated where the design permits.
Follow the supplier system while using specialists for critical work.
The highest responsibility and risk; not appropriate for every pool or homeowner.
The fact that people search for DIY pool construction does not mean every part of the work is suitable for DIY. Check planning, building control, electrical requirements, structural design and manufacturer instructions for the actual project.