Water softeners can be installed by a plumber, or they can be installed by the homeowner. If you are comfortable doing basic plumbing repairs, then you can probably install the water softener yourself. First, you will need to identify where the water line enters your house. This is usually near the main water shut-off valve. Once you have located the water line, you will need to cut into it and install a T-fitting. The T-fitting will allow you to add a second water line that will run from the softener to the rest of your plumbing fixtures. Next, you will need to install the softener itself. Follow the manufacturer's instructions for installation.

Water softeners are not particularly difficult to install, but it is helpful to have some basic plumbing knowledge in order to do it properly. If you're not comfortable installing the water softener yourself, you can always call a plumber to do it for you.