I've been playing pool for a couple years now, and am getting to a point where I'm taking it serious and want to really smooth out my fundamentals. One of my biggest problems right now is my stance and my arm. I know my stance is messed up, because its always changing, and too much of my body weight is on my bridge hand, because my shoulder kills me after a few hours. I also have a serious case of Chicken wing. I am right handed, but left eye dominant, so my grip is far inside, and its really limiting my stroke. A friend at my local pool room who has been helping me for a long time, and has taught me virtually everything keeps telling me to "just change it", but I've been doing it for so long that I'm at a point where to "just change it" seems nearly impossible. I was wondering is anyone has any tricks or secrets to fix either or both. Any input would really be appreciated.