The absolute most critical step is to completely turn off the main water supply to the spigot or your entire home before starting. This prevents unexpected water flow and potential flooding. Always confirm the water is off by opening the existing spigot and waiting for the water to stop flowing.

While specific brands are listed, the core tools needed are an adjustable wrench (or two for counter-tightening), a screwdriver, and crucially, Teflon tape. The '30 in. Steel Sprinkler Valve Key' is only essential if your shut-off valve is deep underground or in a box; otherwise, a standard valve can be turned with a regular wrench. Always ensure your wrenches fit the spigot nuts securely to prevent stripping.

First, ensure you applied Teflon tape correctly, wrapping it clockwise 3-5 times around the threads of the new spigot. Then, check that all connections are securely tightened, but avoid overtightening which can strip threads. A slight leak often indicates insufficient tape or a connection that needs a little more snugging with your wrench.

Three hours is a generous and realistic estimate for a beginner, accounting for locating the shut-off valve, gathering tools, and carefully performing each step. An experienced DIYer might complete it in under an hour. Taking your time reduces the chance of mistakes, like leaks, which would require more time for troubleshooting later.