Getting your record expunged is easier said than done!  Not many people are going to qualify.  Every state is different.  But if you're in Oklahoma, here is the statute to read to see who's eligible for expungement:

http://www.oscn.net/applications/oscn/DeliverDocument.asp?CiteID=452688

But in November, the statute will be replaced with this one:

http://www.oscn.net/applications/oscn/DeliverDocument.asp?CiteID=440214

Getting an attorney is the best bet.  But if you want to file the paperwork yourself, a website has compiled the forms you need.  Here's the link:

www.morelaw.com/states/ok/expungmenets