You can appear without a lawyer, but it's not a good idea. It is difficult to withdraw your plea, but under the circumstances you are best advised to go back to the public defender and review your options. Have them take a short period of time to explain your options and possible outcomes.
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The judge's are usually very solid at locking defendants in to their guilty pleas. If the judge asked you several questions during your actual plea (i.e.- Have you discussed the facts of the case and defenses with your attorney) it will be difficult to go back in change it. The questions that they ask during a guilty plea will usual stop them from coming back to consider a change of plea. I'm sorry to hear about your current struggles. You should consider an attorney who will draft a motion and file it with the court. It's worth a try because it's your record on the line.
Like the others have said, it is very difficult to change a plea. Your "new" lawyer might have been taking so long because they were reviewing the records. It's not something that can happen overnight. All judges will ask if you have gone over potential defenses with your attorney. If you answered yes, you might be out of luck. If you feel certain evidence wasn't presented, there may not have been an opportunity to present it unless you took your case to trial, which it doesn't sound like you did.
Choosing to withdraw a plea because your deal is unfair compared to what others get will not pass as good cause. If you thought it was unfair, the judge will simply ask why you took the plea instead of going to trial.
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What exactly are you trying to accomplish?
Unless you are willing to go all the way to trial in the unlikely event you are somehow successful in being permitted to withdraw your plea with this much time passing after sentencing, you are wasting your time and money.
Law Offices of David Shapiro 3555 4th Avenue San Diego, CA 92103 (619) 295-3555
You can appear without an attorney, but at best, you are likely to wind up in the same place you are now. At worst, you could actually cause further damage.
As others have said, once a plea is entered it is hard to change. I'm not saying you have to give up, but thing long and hard about what you are trying to accomplish and whether you are likely to succeed.
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