Depends on the tank!
30 gallon, remove plastic top, light. Turn off filters, place filter media in a bucket with old tank water (I've had problems with my HOBs siphoning themselves dry during water changes, so this is a preventive measure.) Roll out my siphon/hose to the bathtub. After the siphon starts going, and I'm about ready to fill, I hook up my home made water changer to the sink, turn on the hot water full blast for a few minutes, then start adjusting the temp to 76. Once it's that temperature, I add Prime to the tank, and send the water to the tank.
55 Tall - Turn off filter. No lid, so, just remove filter media to bucket with old water, then run siphon/hose to outside (this is a planted tank, not bare bottom like the others), then do the same with the water changer, but the temperature is 80 instead of 76.
55 Long - Turn off filter. Remove filter media to bucket with old tank water, Same with siphon/hose to bathtub, water changer to the sink. This one has a canister filter too, so every other week, I wring out the prefilter fiber-floss to remove built up sludge. Water temperature 76.
90 gallon - Unplug heater. Only filter is Fluval FX5, turn off valves, remove hoses. Drain most of the contents into a bucket, wring/swish/bang out the sponges, reinsert, put it back together. (I do this weekly if I have time, goldfish are messy poopers.)
Then the same old story after I let the filter run for 2 minutes. Turn the filter back off, run the siphon/hose to bathtub. Water changer to the sink, tank temperature 72.
The two ten gallons, I use a bucket filled at the sink to temperature, Prime it, take out water from the ten gallon, into a 5 gallon bucket. Clean out filter media for either the whisper internal filter (planted tank) or the sponge filter (cory fry.)