Petition preparers – this phrase in some legal systems details the figure of business practitioner, who is not educated in law, but offers typing and paralegal technical services like typing and filling of claims, usually bankruptcy claims. They collect the parts of the claim and its attachments all together and may handle it to the court on behalf of client. But they are not allowed to give legal advice or to perform civil representation in court. In the legal systems where there are no paralegals, the petition preparer is namely the lawyer who is hired to deal with the case.
* Note that lawyers do not work (i.e. accept pressure by clients the opposite parties) for free; their personal advocacy is paid, even when related only to petition preparing. So when asking a lawyer for their legal opinion on a concrete legal issue, you should pay them for their opinion and legal advice; it is the same like when you visit a doctor and pay for their competent diagnose and accurate medical treatment.