Superman (how modest! ;-) )
Welcome - there are lots of excellent resources out there that talk about the pitfalls of poly - the things that most of us have done at some point or another to screw things up. There are also lots of stories of what are sometimes known as "the train-wrecks" - the long emotional horror-stories of people who have got themselves into some really horrendous situations. There is lots to learn from other folks' experiences.
"Listen, or your tongue will make you deaf." - Native American Proverb