Difficult for whom? Sounds like it's accessible from both sides -- the wall in the closet will need to be opened up for the plumbing and then an access panel left behind. I wouldn't do it myself, but I'd think a plumber would do just fine with it.

Installing wall taps for a bathroom sink might seem intimidating, but it's not necessarily ""terribly difficult,"" especially if you have access to the back of the wall from a closet. Since your wall is drywall with wainscot, the installation process could be more straightforward.You'll likely need to create an access hole in the closet to reach the plumbing and install the taps. It's essential to turn off the water supply before starting and follow the manufacturer's instructions carefully.If you're looking for wall taps for your bathroom sink, you can check out some options at Bathroom Taps. They offer a variety of styles and designs that could complement your powder room beautifully.

@LanceAllen

The question was 2 years old. I'm guessing they figured it out.