The install crew spends the first part of a visit on work that has nothing to do with the softener itself: moving things, finding the water line, and checking whether the path to the tank is open. Every minute they spend clearing a path is a minute you may pay for in time, and some of that time may be billed. Half an hour of your own prep usually saves more trouble than it costs.
Walk the route from the door to the utility spot
Start at the door the installer will use and walk the route the way someone carrying a heavy tank would. Note doorway widths, stair turns, low ceilings, and tight corners. Check whether the path is already blocked by a fixture, a water heater, or a stack of boxes. If the route is narrow, ask the installer before the day whether the unit they are quoting fits through it and whether they bring a dolly. Do not wait until they are standing in the doorway to find out.
Settle what gets moved and what stays
Ask the installer which items they will move and which you must move. Homeowners commonly clear stored bins, paint cans, and tools from the utility area, while the installer handles the unit and its connections. Write the split down in a short email that names each shelf, floor area, and drain point. Settle it before the day so nobody is arguing over who lifts a shelf when the crew is already on site.
Find the water line and the drain before anyone shows up
Locate the main shutoff and the point where the cold line enters the house. Find the nearest floor drain or standpipe the installer will use. Confirm that power is available at the spot and that the outlet is not already in use. Check that there is enough clearance around the tank for the installer to work and for you to reach a valve later. If you cannot find the shutoff, tell the installer first, because it changes how they plan the work.
Protect the rest of the house
Cover floors along the route with drop cloths or heavy cardboard. Move small valuables and anything that could be splashed or bumped. Keep pets in a closed room away from the work area, and keep a clear space in the kitchen or bathroom in case the installer needs to check a fixture. Tell the installer where to park and whether the driveway or street is free.
Have the paperwork ready for the day
Keep the quote, your site notes, and a phone number for the person in charge in one place. Expect the installer to ask where the old unit goes, whether you want it removed, and who signs off when the work is done. Those answers should already be written on the quote. If they are not, decide them now rather than during the job.
Check the prep before you confirm the day
Ask yourself five things. Can the unit reach the utility spot without moving a fixture? Is the shutoff found and reachable? Is the drain location confirmed? Is power available where it needs to be? Has each side agreed in writing who clears what? If any answer is no, fix it or ask the installer to confirm the plan in writing before the day. For a wider view of what the whole job covers, the Missouri Water Softener Buyer's Guide walks through the chapters in order: https://bestwatersoftenersmo.com/guide.html