Based on the circumstances you have described, you may very well qualify for Chapter 7, and could possibly file pro se fairly easily providing you have no secured debts that will need reaffirmation agreements, no judgements that would require notices to local Courts, etc. and assuming that you have no issues that would be questionable on your statement of financial affairs. I always recommend using an attorney to file a Bankruptcy especially now that the laws have changed, however, if you are diligent and do appropriate research ahead of time and make certain you are filling out all of the forms correctly, you can certainly file pro se.
You need to be prepared to pay the Court filing fee for Chapter 7, as well as the cost of both pre-file credit counseling, and pre-discharge financial management education courses. Without knowing the exact amounts in your area, I would tell you to estimate this cost anywhere from $300 -$500.
Keep in mind if you file pro se, and some issue arises during your case that you cannot handle on your own, an attorney may charge you just as much to pick up your case once you've done all the work as he would have in the beginning.

