Hey CC! If it's really narrow, train yourself to focus on the trail where you WANT to go. Don't look at the tree, obstacle, etc, because that will focus your attention there instead of where you want to go.

I do this for narrow bridges - look not AT the bridge, rather at the exit where I want to end up.

That said, there are times where you do need to focus on the obstacle. For instance, if the tree encroaches, and you may need to move just slightly to avoid hitting bars, still look at your exit as your focus, but know that you may need a little wiggle room. I would also be off my saddle in this instance - just in case .

Not sure if this makes sense, but it works for me!

SheFly