You can probably do the job yourself, especially if you have a jackplate model Though when you do, have a dealer of make yourself a so it yourself luber’ for the cables. There are pump lubrication systems that put a heavy oil into the cable jacketing, which allows the cable to slide smoother inside of the steel winding.
What happens is the cable wears into the jacket, which is sprial wound wires. The wires eventually get separated as friction increases, and the main cable gets wedged into the wire winding, forcing itself in between those windings.
Once it gets wedged in there, it becomes difficult to steer.
The systems that have been lubricated well with oil will last for years. And greasing the tube will not help, and the grease does not travel into the cable jacketing well enough.
BCB