I just found your community. I have to say I am not at all left-handed. In fact I am seriously right-handed. Why did I join the community? I was taught to knit left-handed but I crochet right-handed. I wanted to share this link from the crochet guild for crocheting left or right-handed. I might be a community anomaly. I hope you don't mind that I joined.
Is there a serious problem following a crochet or knitting patterns, if you are left-handed? I've followed basic knitting patterns and I have never noticed a problem. I am a much more prolific crocheter.