When removing tile or stone from a shower wall resist the urge to smash through it with a sledge hammer or other blunt instrument. While this can be satisfying there can be pipes behind and it creates a lot of extra work when the wall has to be rebuilt. First make sure you protect the area below. If you have a tub make sure the sharp shards of tile do not damage the surface. A thick drop cloth will do the job. Next, cut or scrape into a grout line to access the back side of the tile. It may be easiest to start at an outside corner and work your way in. If you start to have success then slowly work your way into the middle. If your bathroom was installed correctly there should be a rigid surface behind the tile like hardiboard or cement board. This will give you a good substrate to be able to pry against. If the grout is holding the tile in place you can use a heat gun or hair dryer to soften the grout. If you do damage parts of the wall it can always be filled with a compound but it does add to material and labor cost and time to do this

The best tools for removing wall tile are:
Heat gun for softening grout
Small pry bar
Flat head screw driver
Chisel and hammer
Oscillating saw
Angle grinder with tile blade or Dremel tool with tile cutter
Sledgehammer (if you aren’t concerned about damaging the wall)
Pneumatic hammer with chisel bit

The best power tool to use is a Pneumatic air impact hammer with a chisel bit. If you have to remove a lot of tile be sure to get a compressor with a large air volume capacity. This way you won’t have to constantly be waiting for the compressor to fill up when you drain the air out of it.

The first thing to consider when you have a tile pop out is what actually caused this to happen. If it was just time and/or poor workmanship then a standard remedy will work. If the tile is popping due to water issues then be sure to check you don’t have a leak behind your wall or under your floor. You can do this by checking your water meter when everything is shut off. If moisture is not the issue then there is a simple fix. Drill into the grout around the hollow tile so that you can get a large enough hole to inject an adhesive in. There are numerous manufacturers including Fix-A-Floor that sell an adhesive that you can inject into the hole so that you can adhere the tile without removing it.

Sometimes when you remove tile you actually want to prevent damaging it as you take it off. The first step is to remove the grout between the tiles. This can be done with a tile rake, or, if you have a steady hand, with an angle grinder. Carefully choose the first tile to pry free as this one will probably be the most challenging. Look for the corner that appears to be most available for prying. Using a chisel or flat head screw driver gently pry the tile free as you work your way around the tile. Try not to force the chisel in by being too eager with the hammer. Most importantly, be ready for the tile to fall. Either have a place for it to go or use tape so that once it becomes loose it is hanging on the wall by the tape that is stuck to adjacent areas.