- find the line. look ahead but not too much at anything in particular. finding where the line is will depend on the trail, your speed, lighting, etc.
- be intense, but relaxed. if you worry about something, it will usually bite you. if you're aware of it and just deal with it, things generally work out better. also, as above, no death grip. if your handlebars turned into a piano, you should be prepared to play it (or some BS like that) at an instant.
- use your legs to balance you. shift your weight where you need it. don't laze out and stay on your seat all the time.
practicing clipless pedals on non-technical trails will make you more comfortable.