One of my big rules has always been, “double it, or cut it in half.” Don’t waste your time adjusting something by 5 percent, then another 5 percent, then another . . . just double it, and see if it even had the effect you thought it was going to have at all. If it went too far, now you know you’re on the right track, and can drop back down accordingly. But maybe it still didn’t go far enough, and you’ve just saved yourself a dozen iterations inching upward 5 percent at a time.
