The absolute worst thing you can do in a scene is be apathetic.
Trust...trust your fellow actors to support you; trust them to come through if you lay something heavy on them; trust yourself.
The truth is funny. Honest discovery, observation, and reaction is better than contrived invention.
The only rule is that there are no rules.
If the whole is to be Art, the parts must not try to be.
It's not about the journey. It's about the people you meet.