Follow focus using LCD in 550D: how are you supposed to use it?

[PaulJBis]

Hello:

I own a 550D and am using ML stable 2.3. How are you supposed to use the "follow focus using LCD" feature? Are you supposed to move your hand right-to-left, left-to-right, or just hold it on the left/right side of the LCD?

I am asking because I'm unable to get any consistent results. No matter what I do, the lens moves one or two steps, and then stops. Actually, what happens most often is that I can get it to go in the "+" direction, but then, when I try to move the lens the other way (in the "-" direction), it doesn't do anything.