There are 2 things to consider - the club path and the club head. I would start with squaring the club head first then work on the path. One of the common reasons for coming OTT is a poor grip. In this case, you try and square the club up with the shoulders. Have your pro recheck your grip. If you are coming OTT you may start pull hooking, but that is ok as you are starting to square the clubface. Then start working on the club path.