I am a lefty and have been using both hands to make sure I can get all the correct angles. Its not easy to "train" your off hand for straight shaving but there was a great tip over on Straight Razor Place the other day. Use your off hand to brush your teeth. This will help you develop a lighter touch and getting to difficult hand angles. Just a week of this improved my off hand noticeably.
"Politics is supposed to be the second-oldest profession. I have come to realize that it bears a very close resemblance to the first". - Ronald Reagan