Congrats on the quick timeline
I know for our first homestudy (I actually had two with two different agencies...long story) I did a major cleaning and wanted everything spotless. She didn't even look at all the bedrooms!! She basically just peeked around and kinda looked at specific things (I am sure she would have looked harder had we already had children in the home). Then we sat at the kitchen table and talked. For our second homestudy, I just cleaned like I normally do the weekend before. She looked more around than the first, but as a guest, asking questions about pictures and things. She did it more for personal reasons than the homestudy. For example, I have a 4 foot cookoo clock in my house, it stands out like a sore thumb, so I was laughing telling her the story behind it (dh's crazy grandma gave it to us for christmas, we couldn't NOT put it up, we pratically pee'd our pants when we opened it trying not to laugh).
Anyways, just relax and make sure all the major things are there (fire extinguisher, etc).
Good luck, let us know how it goes!
Natalie