As said, there are many ways to make it simple. Just depends on the situation and what you want to do to make it happen. My fish room was in a spare bedroom backing to the gargage where my softener sets. Plumbed a faucet throught the wall to get untreated water, added a PVC tube to reach all tanks and a reserve water barrel. With drains available and water stored, it becomes a matter of sticking the syphon in the drain and starting it. The drains lead outside to gardens or yard. When drained I turn on a pump in the reserve water and refill.
Most of the drain/refill time is used to clean glass, trim plants or just set and watch the fish.