If your fluid is low or dirty do the above recommended with the turkey baster. This is the lazy way to change fluid, I did it on my girlfriends saturn.
I sucked as much as I could out, topped it off with clean fluid had her turn back and forth (front of vehicle jacked up, engine running), repeated until fluid was 90% clear which took about 2 quarts. I would assume you would have it mostly clean after a gallon
You'll never get it all unless you do an actual flush though.