A good way to approach the decision of whether to hire a lawyer is to buy (and read) Nolo's book How to File for Chapter 7 Bankruptcy. It will give you a good idea of what issues may arise when you file, and flags specific situations when a lawyer's help is called for. It will also give you a good idea of whether the filing process seems to complicated for you.
The most common types of personal bankruptcy for individuals are Chapter 7 and Chapter 13. Chapter 7, known as a "straight bankruptcy" involves the discharge of certain debts without repayment. Chapter 13, involves a plan of repayment of debts over a period of years. Whether a person qualifies for Chapter 7 or Chapter 13 is in part determined by income. As many as 65% of all U.S. consumer bankruptcy filings are Chapter 7 cases.