Have to qualify as an expert in court prior to giving expert opinion. Must establish your credentials on the issues you wish opine about.
The judge may not allow it; even if the judge did, it would be a really bad idea.
Expert witnesses are most effective when they are unbiased and impartial, with no stake in the outcome. The opposing party often tries to paint an expert witness as a "hired gun" who would say anything for money.
You obviously have an interest in the outcome of the case, so your expert testimony would be highly vulnerable to attack.
This is NOT legal advice. It is a general discussion of legal principles by a California lawyer, and does not create an attorney/client relationship. You should always consult PRIVATELY with an attorney.
An expert witness is supposed to be a neutral in the case, retained for his independent knowledge and study.
If the case is a jury trial I doubt the judge will allow it; if it is a bench trial a judge may listen.
Nevertheless I think it is a long shot.
Any evidence you gave would be tainted by the fact that you are a litigant with a specific goal in mind. The credibility of your entire testimony would be in jeopardy.
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Litigating anything significant on such a tight budget that you aren't or can't afford an attorney or an expert is a bad idea. In theory, yes, a party can be a non-retained expert witness. In practice, you will have to make appropriate and timely disclosures of your intent to do that, and will have to know how to qualify yourself as an expert at trial. Even if you achieve all of that, of course you are going to be considered biased. It's a really bad idea.
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