Remember that time when your partner flagged a leak under the sink and suggested calling a plumber? "How hard can it be," you asked. A few grunts and speculative twists and bangs (and a few choice words) later, not to mention a generous application of duct tape, the leak had stopped. Disaster averted (at least until the problem resurfaced a few weeks later). And it was even worse that time. The kitchen flooded, causing more damage than Vesuvius.
DIY, unless you genuinely know what you’re doing, always comes at a cost. Sure, you can learn to become a better plumber. But plumbing is a specialty — and an expensive service — for a reason. On average, it takes nearly a decade to learn the ins and out of the trade.