I have two judgments against me though I have not been served in person or responded by mail. Do I need a lawyer to help me with this?

The answer to your question is effectively yes.  While you could go about the process of attempting to set aside these Judgments by yourself, the process for setting aside Judgments (including the challenging the propriety of the original service of process) is relatively complicated and will require a motion and presentation of evidence to the Court.  You should consult with an attorney regarding the facts in your matter and basis for setting aside the Judgment(s).