For information, go to http://uscis.gov/graphics/services/natz/index.htm. You need to fill out N-400 following the exact instruction. It is quite simple actually. Do it yourself. I applied in February and got it in June. However, the wait time varies slightly depending upon where you live/apply. You can find out the processing dates here: https://egov.immigration.gov/cris/jsps/ptimes.jsp;jsessionid=akatueS_Woi4. Check out district office processing dates for N-400. Hope it helps.