Salt is a regular chore for any softener owner. Loading the tank yourself and paying for delivery are both reasonable choices, and the right one depends on your body, your space, and your schedule.
Count the lifting and the trips
Salt comes in bags heavy enough to strain a back, and bulk delivery is usually dumped into a storage bin. Be honest about how many bags you can carry safely in one trip and how often you would need to make them. If the work is hard on you, delivery or a helper may be the better choice. Do not lift alone if a bag is heavier than you can control.
Check the storage space and the mess
Store salt somewhere dry, off the floor, and away from anything a spill could damage. Bags left in humid spaces can clump, and clumped salt does not dissolve well in the brine tank. Check whether the spot you use is near the drain, the water heater, or the laundry area, where a spill would be hard to clean up.
Match the fill to the schedule
Ask how the unit signals that it needs salt, whether it has a level indicator, and how low the level can drop before softening suffers. Decide who will check the level and how often. A written reminder on the wall or in a phone calendar works better than memory. If you are away for long stretches, ask whether delivery can be set on a schedule.
What to ask a delivery company
Ask which salt type they supply and whether it matches the manufacturer's recommendation for your unit. Ask who places the bags in the tank or bin, whether the driver checks the level, and what happens if the delivery arrives when no one is home. Ask whether the schedule is tied to a contract, and keep the answers in writing.