Can I have my misdemeanors expunged without an attorney?

You always have the right to represent yourself, but unless you have particular skill and legal knowledge appropriate to the task, you will likely be disappointed in your efforts. There's a reason why it takes so much time and effort to become a lawyer. You can always pull your own teeth or remove your own appendix, but that doesn't mean it would be wise to do so! In fact, it would be extraordinarily foolish.