There should be either a button or menu option for wb, though you might have to scroll through
a couple menus to find it. The fastest way to find it would be to check your user manual, for newer canons you can usually find the manual online.
Once you know how to adjust it just try out the different options until you find the one that gives you the most natural look. With wb adjusted you shouldn't need the flash either. If the picture still won't come out right for whatever reason you can always do some touch ups with an editing program. I'd recommend downloading picasa, it's very easy to use and free :)
I have the same problem of not being able to move things around easily, my usual method is to inch a bit of fabric under the legs to protect my floors and repeatedly body slam the piece into place hehe I'm a featherweight but I've moved some pretty big pieces this way! Of course if it's too delicate or you're not on very smooth floors I doubt this would work...