I learned or forced myself to use either hand. At 14 I broke my right arm and had to learn to write (cursive) with my left hand. From that point on it became kind of a game between my brother and I to try to do everything opposite handed. Throwing, batting, writing, you name it we forced ourselves to become good at using either hand. I mess up people when I am writing especially in an conference room on a white board because I will switch hands without thinking about it. Those who catch it often ask me about it. I find that some things when working on leather are easier for my dominant (right) hand and others can be done with either. Stamping is either hand. Knife work because my fine motor skills are better with my right hand are easier that way. I have tried some knife work on scrap leather with my left hand and would need a lot more practice before I would do anything I intended to keep.