Photography advice: Just do it!

After a visit to Apple's Genius Bar in Reston, I walked on down to the ice skating rink in the Town Center.  Watching the skaters, I wanted to get a shot showing movement.  If I was lucky, I’d get skaters blurring, somewhat like ghosts.

Well, the brightness of the ice was so great that it wasn’t possible to shoot at a slow speed (to get the blur) without greatly overexposing.  

This image is essentially out of the camera, taken while I fiddling with the aperture and speed and ISO and what not.  Call it a lucky shot.