You can represent yourself, but a good attorney would probably do a better job at representing you. For example, once you plead guilty you can utilize your speedy trial rights in a strategic manner to make the prosecutor's job difficult. This will lend itself to a favorable plea bargain or dismissal. You got to know precisely how to preserve your speedy trial rights, and what to do once they have have been violated. This is the stuff of criminal defense attorneys. Going it alone is at grave peril.