[barnoun]

First adjust the front pressures(using chalk like Ricebox suggested) to make sure the tires aren't rolling over. When you find a pressure where they don't roll over, set the rears to the same pressure. After that raise or lower the rears to get more rotation. (Having the rear higher than the front will generally cause the back end to break loose abruptly, while having the rears lower than the front will cause them to lose traction more gradually. It's your choice on how you want the rears depending on your driving style).