You are instructed to install all the window and door trims now, but I don't recommend it. If you do, you'll need to wallpaper everything before assembling the dollhouse. While this approach won't ruin the final result, I prefer the traditional method - build the shell, wallpaper it, and then add the trim. So, I started with step two, which is building the shell.
I began assembling the base of the dollhouse. The instructions lack illustrations, so I relied on common sense to piece everything together. Fortunately, the clamps I'm using keep everything square and flush, so I didn't have to worry about alignment. I used tacky glue to secure the base and then applied wood glue along the seams.
Once the structure was dry enough to handle, I attached the left wall. Binder clips held the bottom of the wall in place against the base strip it's laminated to. I installed the right wall in the same way, using binder clips and a piece of masking tape to align both walls at the top by taping them together. Again, I applied wood glue to all joints between the walls and floors.
Next, I glued on the front right and left walls. I used a box cutter to remove the cross window patterns from the windows since they weren't needed for my design. After that, I glued in the center partition to connect all the walls. To ensure a tight fit all around, I needed to install the second floor. It was easy to position but challenging to clamp securely.
Once everything was dry enough to handle, I applied wood glue to all joints while turning the dollhouse on different sides to prevent drips.