I'm also a lefty. When I decided I wanted to knit I tried it left handed but no one could show me how to do it. I then went to knitting classes for right handers and finally was able to get it. It took a lot of practice and many of my things wound up across the room ...hahaha... In the beginning I found it very mentally exhausting going against the grain all the time. Now I'm fine, I just wish I could knit better.