I would say, if possible - find a coach. These are complex moves and fast - thus difficult to monitor oneself. And it takes a while to get it right. I'm still doing silly stuff, like not jumping wide enough - then I fall over backwards, although my weights are coming up nicely lately. My coach watches each and every lift and reminds me after every set of what I'm neglecting, or where I'm erring - invaluable feedback.
I agree that the bar needs to be as close to the body as possible, and it's normal to have it graze past the breasts some days, but I haven't been hitting my tits lately - I'm a B-C. Although I did manage to somehow "drop" the bar right across my thighs tonight - 135lbs feels quite heavy in that situation.
Thus - ALWAYS throw the bar AWAY from you when it's not gonna go.