This project is rated 'beginner' because the steps are straightforward, but it requires patience and attention to detail. The trickiest part is often removing old, corroded screws or a stuck cartridge, which might require a bit more force or specific tools like a cartridge puller.

While a flat-head screwdriver and pliers are essential, you might also need a Phillips head screwdriver, an Allen wrench (for some set screws), or an adjustable wrench for securing nuts. Having a utility knife for scoring caulk and a flashlight can also be very helpful to see into tight spaces.

Common mistakes include not fully turning off the water supply, stripping screws due to using the wrong size, or purchasing the wrong replacement cartridge. To avoid these, double-check the water is completely off, use the correct size screwdriver for all fasteners, and take the old cartridge to the store for an exact match.

The primary cost for this repair will be the replacement cartridge or a set of O-rings/washers. Cartridges typically range from $10 to $50, depending on the faucet brand and model. While the repair is estimated at 2 hours, seized or hard-to-remove components can extend this, so allocate extra time just in case.