lol I was too. *Blush* So I was like why not move it so the Tea Room is first.

As I check it first.
House renovation - This is one of the times I actually left the family on the lot. lol
I removed the roof fully.
The half that I added the stairs too, I removed the furniture, walls, furniture, lights and whatnot, put what I could in the family inventory.
I removed a little bit of the foundation and then drew out a rough shape of the basement at first. Placed the stairs and then drew out the rest of the basement and started putting things back together.
It wasn't as hard as I thought it would be because the house lended to the renovation well. A house more furnished/decorated maybe more difficult to renovate.
Saved the wall coverings to wall pieces I placed out in the yard. So I could copy them back into the house.
If you'd like I can see if I can come up with a how to to help give you a visual?