I signed a waiver to represent myself can I change to get a lawyer

If you hire an attorney who can be present on the date and time for which your case is currently set for trial, you will be allowed counsel. If you or your lawyer is requesting a continuance, the Court CAN deny your request since you have already signed a rights waiver.  The Court will consider whether the case has been continued before, how long you waited to change your mind, and other factors such as witness availability/inconvenience, etc., in making a decision. A good attorney in your area can help.  You should speak to several and hire the best one you can afford.