Handedness and mirror tasks

I am very left-handed: I am not one of these people who does a couple of things right-handed because that's how they were taught to me, it's more like if I try to use my right hand for long for something then it can make me start to feel peculiarly agitated. Except, I've noticed, for trimming my facial hair: my moustache, around the top of my ears, whatever, I am looking in the mirror and using my right hand. It's a fairly brief use, of course. Still, I wonder if others also use their nondominant hand for such.