The complexity of installation depends on the type of water purification system and your level of expertise. Some straightforward systems can, in theory, be installed by homeowners. However, more complex systems like UV systems require professional installation to ensure proper plumbing, sizing, and functionality. It's always worth seeking assistance when it comes to water treatment or sulfur in well water in the first instance to ensure that the treatment solution will achieve the desired outcome, whether that's soft water, the removal of contaminants, and so on.