Disconnecting power is the most critical safety step to prevent severe electrical shock or injury while working with the unit. Always verify the power is off at the breaker or by unplugging the unit directly before touching any wires or plumbing connections.

A basin wrench is highly recommended as it's specifically designed to reach and loosen the nuts in the tight, awkward spaces under the sink that regular pliers often cannot access. While pliers might work for some visible nuts, a basin wrench will make the job significantly easier and help prevent stripped fasteners.

This project is rated 'beginner' because it primarily involves disconnecting and reconnecting pre-existing parts, not complex plumbing theory or pipe soldering. The 3-hour estimate accounts for potential learning curves, gathering tools, and careful testing, making it achievable for most first-timers if instructions are followed diligently.

The most common causes for leaks are improper sealing around the sink flange or loose plumbing connections. To prevent this, ensure you apply a generous, continuous rope of plumber's putty around the sink flange before seating the disposal, and meticulously hand-tighten all pipe connections before a final quarter-turn with tools.