You can file it yourself. I think the attorney suggestion is because the judge will take it more seriously coming from an attorney--especially an attorney he knows. And an attorney will know what arguments work with your judge to get the best result.
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Probationers generally have very little credibility with the court. For some reason, when filtered through an attorney's presentation to the court, the points the probationer wants to make often seem to be much more believable to the court.
Also, if the probationer is not a lawyer, the probationer is likely to "leave chips on the table" as the saying goes. A simple termination of probation early is not the same as a termination early with the conviction set aside and the case dismissed. A pleading (meaning a written request to the court done formally according to the applicable rules of procedure)...a pleading is a technically complex document that ought to cite the various laws that govern the situation. Do you know those laws.
I could go on. Instead, I recommend that anyone seeking early termination seek the advice and assistance of a good criminal defense lawyer.
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