It is pretty normal and I believe that most kids, esp ones who read well, self correct with these things in time. My DS6 (then 4)decided to write his name with his first letter backwards for about a year, just because he wanted to be different at first I think, then it became habit. No one said anything to him (because he is a perfectionist and wasn't really keen on him going on a writing strike again because he was afraid it wouldn't be perfect) and one day he just started doing it correctly.
I have found my son isn't really very interested in being taught much at all, he'd rather learn it himself. He tends to retain these new skills better I find.
