If you entered a plea of guilty or no contest in court and the judge accepted the plea, it will be all but impossible to withdraw your plea. You need judicial permission. That will be difficult to obtain because the judge probably asked you questions ("canvassed") and probably a couple of the questions were to verify that you knew what you were doing, if you had adequate or were satisfied with the legal advice, and if you wanted the court to accept the plea. In light of all that, having second thoughts is not enough to have your plea withdrawn. If you have not entered a plea of guilty or no contest in court, then you do not have to enter a plea to accept the deal.
Answered on Aug 22nd, 2013 at 12:11 PM