Congratulation on the job. It is great feeling getting a new customer, and even greater feeling when the job is well done.
I can share some advice that might help you calm your nerves. In the beginning I was very nervous that I might make a mistake on the location. So I made a check list with my workflow that I could go through step by step to make sure I did not make any mistakes. It helped me a great deal. I also asked to be left alone in the rooms. Then there was no pressure (don't know if that is spelled correct) and I could focus on taking the pictures.
Just like Dave suggest, I would also suggest that you take a lot of pictures from different locations in the room. For instance the outcome will look way different if you place your camera by the door (being able to see the vies outside the door, and the room looks bigger) then if you place the camara in the middle of the room.
Once more congratulation on the job.
- a newbie trying to improve