A straight swap, where the old opener comes down and a comparable new one goes up on the existing rail and wiring, is a controlled job with a predictable sequence: disconnect, strip the old unit off the ceiling mount, hang the new head, run the rail, wire the wall control and safety sensors, then set the travel limits and test the door through a full open-close cycle a few times. Where it runs long is when the rail doesn't match, the header bracket needs rework, or the house wiring for the wall unit isn't where the new opener expects it. On a 1995-era home, we've seen enough of these to have a rough sense of what to expect, but we still budget the visit as if something won't line up on the first try.