The trick is momentum, leaning back, and steering with your feet. Ruts can unravel your nerves at first, but you figure it pretty quick. The hardest part is starting and stopping. So you learn to just not stop, and if you really have to, try a straight firm spot.
In all honesty, there isn't THAT much sand to deal with.
"I don't know what you do, but I know what I do, and I don't do that." --Uncle Doug, R.I.P.
"Without the possibility of death, adventure is not possible"--Reinhold Messner