I have a little advice to make water changes a little easier. It will actually be a little more work the first time, but after that, it will be quite easy.
1) Determine how much you want to change (Let's say for example, you want to change 15 gallons of water 8O )
2) You need a rubbermaid garbage can (with enough capacity to hold 15g)
3) You need a 5g bucket (the first time)
4) You will need enough nylon tubing to reach where ever it is that you dispose of your water (ie...bathtub, window, door etc....)
5) you need a small water pump/powerhead (the nylon tubing needs to fit snugly (read tight) on the output of the pump/powerhead)
6) OK Fill the garbage can 3 times with RO
water from the 5g bucket (=15g, have a line drawn in the bucket so it is filled to the same level each time) mix this water to make your S/W.
7) Mark the outside of the bucket with a dark
marker (oh yeah, light colored buckets work best for this, but you can figure a way to make a mark on a dark one too, I'm sure) at the 15g water level, so you can see it from the inside (I did this evey 5 gallons on one of my cans, so I had a graduated bucket, upto 33 g) After this, you can simply fill to the mark, no more need for buckets.
8) After the water has mixed for 24 hours (that powerhead/pump works well for this), turn off all your pumps and allow it to stop draining to your sump.
7) Fill the 5g bucket to the line, 3 times from your tank.
8) allow the water to settle a minute and make a mark on the tank (in an inconspicuous place) to mark the water level. (I use a piece of scotch tape with the top as the mark of the level)
9) use the pump and the tubing to fill the aquarium.
After this point, once the water is mixed, you can simply use the pump and tubing to drain the tank to the marked level, and then fill with the mixed S/W. That is why you need a long piece of tubing, so you can simply run the tubing to wherever it is that you dispose of your water. With this method, I could do Sue's 30g water change in (the time needed to mix the S/W) + 10-15 minutes. Of course I would be using a Mag 12 or Mag 18 as my pump, but still, no more than 20min even with a Mag 7 or 5.