100%, right handed, almost screwed up a lot. Left handed people are more spacial thinkers, they use the right side of their brain the most, I forget what right handed people are, it's something like logical or something, but I had to force myself to look at the color the word was written in and not choose the word. But it wasn't too bad.
EDIT: Next few times I tried it, I just looked at the word color, and moved my mouse until it was over the right color without looking away from the word, much easier.