If your opponent has a lawyer and you attempt to go up against him/her yourself, you will likely get crushed, because you will not know how to conduct discovery and prepare a response to a motion for summary judgment.
That said, if you want to try to "do-it-yourself," then I suggest you get these two publications at a minimum:
There are layperson guides to representing yourself in court, and they will explain the basics. Eventually, however, you will be confronted with some sort of deadline or pleading that you won't understand, and the layperson guide will not address the issue.
Which is, of course, why there are lawyers.
Hope this helps.
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