How do I get a misdemeanor expunged?

Ok so here is what happened. I plead guilty to a retail theft class a misdemeanor charge 2 years ago this month. My sentence was 6 months court supervision and court costs. I have not been in trouble ever but this one time. In the state of Illinois the law for retail theft is 2 years after your sentencing is complete you can get your crime expunged if its retail theft. I have not been in trouble since this. I had a background check done when I applied for a job. The third party company sent me a copy. It showed the crime and said sentence: Terminated unsatisfactory or unsatisfied I can't remember. I forgot to pay my court fees and got a letter from a collection agency. So here are my questions 1. What does the sentence unsatisfied mean? 2: Can the circuit clerk tell me who I need to pay because I lost the notice? 3: I want to pay my court costs off in February. Will I still be able to get this expunged in May or because I am paying the court costs in February do I have to wait another 2 years after that? 4: How do I go about getting this expunged? Do I need a lawyer or can I do this myself? Please someone help me I am so worried sick about this and am unsure about whats going on. Thank You.