Don't worry. You will be fine. 485 RFE means someone has already checked your 485 material and they had outlined what they want from you. It's not like I140 application, so many thing subjective to the mood of the officer. 485 only ask for something concrete and is easy to satisfy. Based on recent posting in this forum, you can see USCIS has accerelated their process of pending 485. So, good news are waiting for you ahead. Not far away. ^)^.
Cheers!