You can absolutely change exposed hinges to hidden hinges! The process is actually quite simple, and all you need is a few tools and materials.
First, you'll need to remove the existing exposed hinges. To do this, simply unscrew them from the door and frame. Next, measure the distance between the holes in the door and frame so that you know what size hidden hinge to purchase.
Now it's time to install the new hidden hinges. First, drill pilot holes in the door and frame using a drill bit that is slightly smaller than the screws that come with the hinge. Next, insert the screws into the pilot holes and tighten them until they're snug. Be careful not to overtighten or strip out the wood. Finally, close the door and check that it opens and closes smoothly.
If you follow these steps, you'll be able to easily change your exposed hinges to hidden ones in no time!