Doing the install yourself is a real option for some homes, but the decision should rest on the actual pipe work in your house, not on how handy you feel. Before you buy tools or call anyone, find the connection points and decide which ones you are comfortable making.
Map the existing plumbing first
Trace the main water line from where it enters the house to the point where the softener will sit. Note the pipe material, the shutoff valves, and whether any section is hard to reach. Copper, PEX, and galvanized lines call for different connections, and an old galvanized section may crumble or leak when disturbed.
Know what the connection method requires
Some kits use push-fit or compression fittings that need only a clean cut, a deburred edge, and firm seating. Others require soldering near the unit, which means heat, flux, and a fire check of the area. If the install needs soldering close to wood framing or near a finished wall, that is a strong reason to hire the work out.
Check the drain and the bypass
The drain line must connect in a way that prevents backflow into the water supply. Confirm your setup follows the manufacturer's instructions and any local plumbing rules, and ask a licensed plumber or your city's building office what the local requirements are. The bypass valve should be installed so you can isolate the softener without shutting the whole house off, and you should be able to reach it easily.
Look at the electrical and permit side
Confirm there is a grounded outlet within reach of the control head, and do not improvise a power source. Ask your city whether a permit is needed for the work. Rules differ by municipality, and a permit question is easier to settle before the work starts than after.
A simple decision rule
Consider doing it yourself only if all of these are true: you can shut off and drain the water safely, the connection method is one you have done before, the drain and outlet are already in place, and your city does not require a licensed installer for the work. If any of those is not true, get a quote from a licensed plumber and compare it to the installer's scope.
After any install, run the system, check each joint for drips over the first day, and confirm the first regeneration runs as expected. A leak found in the first hour is far cheaper to fix than one found behind a wall a month later.