Where do pros se litigants most often fail? Is it because of ignorance of legal protocols? Is it because they use overly aggressive tactics that most lawyers wouldn't use? Is it because they failed to prove their case, when a competent lawyer might have succeeded?

This question was inspired by one of the the answers to [another][1] one.

[1]:https://law.stackexchange.com/questions/206/what-resources-are-available-to-a-pro-se-litigant