I had a holiday that included a bit of skills tuition.
I think its been commented on briefly already, but what really made a difference for me was being taught to lean the bike right over into the corners, keep the body upright above the bike, and point your belly button (i.e torso) the way you want to go.
It has the effect of using the side knobs of the tyre much better, and when you start to slide out, because you are above the bike rather that leaning to the inside, you slide with the bike rather than it slipping away from you and dumping you on the trail.
I was taught this on one morning, a couple of days later I did my first (albeit minor) two wheel drift, it was unplanned, just a bit too much speed on a gently curving bit of track with gravel, but instead of the usual arse clenching moment followed by going wide and losing my line/going off the trail, the bike just walked sideways across the corner and I exited still on top of the bike 🙂
Its made me faster and more confident.