If you are uncomfortable with an attorney, then get a second opinion. You might not like someone who does not tell you the details. You may prefer to know exactly what is happening. On the other hand, you might prefer to know less about the problems. Often, you get what you pay for and sometimes you get even less.
Extortion is a tool of non-attorneys.
However, if an attorney has spent time on your case, then you must be prepared to pay their fees. Attorneys have an attorney-client relationship that can bar them from practice, where they expose your confidential information. The unlawful non-attorney does not have such a responsibility, but can be indicted for filing and filling out INS forms for money. Often, it is the alien rather than the non-attorney that can get into the most trouble without the involvement of an attorney. You must know whether you should apply, how you should apply and that telling the truth is not necessarily fatal.