It depends on where you are. From 2.5 to 3.5 or from 3 to 4, all you need is one point, but that won't happen unless you keep a position for a few days (and maybe even weeks) or you find out someone is not playing (a major line move happened this year when Vick didn't play against New England)
Just do some work and play some Monopoly money plays on line moves and scalps. Track your record and you'll start to get it.