Installing a wall-mounted western toilet requires a bit of plumbing work and carpentry, so it's a good idea to have a professional plumber and carpenter do the installation. However, if you're comfortable with basic plumbing and carpentry work, here are the steps you can follow:

1. Prepare the site: Clear the area where the toilet will be installed and make sure the plumbing and drainage connections are in place. Mark the height where the toilet bowl will be mounted on the wall.

2. Install the wall-mounted frame: The wall-mounted frame is a metal frame that attaches to the wall and supports the toilet bowl. Follow the manufacturer's instructions to install the frame onto the wall, making sure it is level.

3. Connect the plumbing: Connect the plumbing to the frame, including the water supply line and the waste pipe. Follow the manufacturer's instructions for the specific frame and toilet model you are installing.

4. Install the toilet bowl: Mount the toilet bowl onto the frame, making sure it is level and secure. Connect the bolts and nuts to the frame and tighten them.

5. Install the cistern: The cistern is the tank that holds the water used for flushing. Mount the cistern onto the frame and connect it to the water supply line. Follow the manufacturer's instructions for the specific frame and toilet model you are installing.

6. Install the seat: Attach the seat to the toilet bowl, following the manufacturer's instructions.

7. Test the toilet: Turn on the water supply and flush the toilet several times to ensure that it is working properly and that there are no leaks.

That's it! Installing a wall-mounted western toilet can be a bit of a challenge, but by following these steps and being careful during the process, you can successfully install your new toilet. Again, it may be best to hire a professional plumber and carpenter from Locals4u to do the installation if you're not comfortable with plumbing and carpentry work.