I try and practice two days a week. Wednesday is focus on the skills like front wheel hops, back wheel hops, and balancing. I still ride in sections, but make sure I stop dead before each obstacle, do at least a 5 count balance, either two front or two back wheel hops before I move into position for the obstacle.
During these sessions I also try and work as much basic terrain skills into the section as possible, like camber turns, small to medium size logs, drop-off's, hill climbs. Then run the section in reverse.
Then saturdays is usually riding with the boys where we practice riding actual sections. We seldom take time during these sessions to practice the basics. And like everyone else have mentioned, spend time on the bike without the engine running, it makes the world of difference!