Faces aren't set in stone, despite what your local grump seems to demonstrate to the contrary. Practice feeling resentful every day for a decade and see what kind of mask, I mean face, you end up with. I wouldn't recommend it.
We normally don't think of our faces as carrying tension, but oh baby, they do. As you no doubt know, being such visual creatures, humans draw tons of information from the facial cues of others. How we face the world, the face we "in-habit", effects how others (you know: them) think of and interact with us, and more importantly, how we think and interact with ourselves.
Break apart tensions in the face and you begin to break apart your ideas about your face, among other things.
That's quite an assertion. Personally, I'm very much in the, "Yeah, yeah, cut the crap and show me already" camp. The best argument in the world doesn't mean much if you can't take it out in the world and apply it. I hate convincing, opinions, and endless yammering (although I'm ashamed to admit I sometimes enjoy arguing, especially if it's against a position I agree with). So boring. Your direct experience is your most valuable guide:
Five minutes is all it takes to verify for yourself. Over time, doing the face stretch for five minutes a day will build permanent pathways from tension to relaxation in your body.
You can drop your chronic feelings of over-preparedness and background emergency (I'm talking to everyone else, of course, of course), and get a clearer picture of what the hell is really going on around you, and what you would really enjoy doing.
Slow down. Stretch your face. Do it each morning for a week (35 minutes! my god!) as an experiment and see what happens. Or not. Face it, you don't need to.