Just be careful removing the drain so you don't twist the pipes under the tub or break the drain. They come in several different sizes and some have fine thread while others have course threads and make sure you don't loose the rubber gasket that goes between the drain and the tub on the bottom side. When you reinstall the drain make sure you get it good and tight. There is a special tool called a spud wrench for this and I would suggest that you have one. Good luck