Look, plumbing is basically adult LEGO with water. You can do this. And if you accidentally turn off the wrong valve and your neighbor’s sprinkler system starts, well… that’s a story for another barbecue. The important thing is that you tried, you learned, and you probably didn’t flood the bathroom.
Remember: water always finds a way—but you control the valve. So go ahead, conquer that cylinder, and enjoy the quiet satisfaction of a job well done. You’ve earned a warm cup of tea (from the kettle, obviously) and a peaceful, leak-free day. You’ve got this, my friend. Cheers to dry floors and brave adventures!