When casting long line Euro style to the upstream left side, I find it best for me as a right hander to cross my body with the rod as the drift comes down stream and as I pull back the line I swing the rod around the back of me like a lasso to redeploy the fly from the right side. I guess its kind of common sense and for some and not even something you have to think about, but for me it enables me to drop the fly in the same direction as the original cast to the left. Just something I worked out and thought I'd mention.