Installing or repairing a jet spray (also known as a bidet spray or hand-held sprayer) typically involves the following steps:

1. Turn off the water supply: Before you start any plumbing work, turn off the water supply to the area you'll be working in. Locate the shut-off valve, which is usually located under the sink or toilet. Turn it clockwise to shut off the water.

2. Remove the old jet spray: If you're replacing an old jet spray, unscrew the hose from the bottom of the spray and remove it from the holder.

3. Install the new jet spray: Take the new jet spray and insert it into the holder. If necessary, use a wrench to tighten it in place. Then, attach the hose to the bottom of the spray and hand-tighten it.

4. Turn the water supply back on: Once the new jet spray is installed, turn the water supply back on by turning the shut-off valve counterclockwise. Test the jet spray to make sure it's working properly.

Repairing a jet spray may involve checking the hose for leaks or replacing the gasket inside the spray. If the hose is leaking, turn off the water supply and unscrew the hose from the bottom of the spray. Check the hose for any damage or wear, and replace it if necessary. If the gasket inside the spray is damaged, you may need to take the spray apart and replace the gasket. If you're not comfortable doing this, it may be best to hire a professional from Locals4u to handle the repair.