Lighting a collector dollhouse
So we see you're serious about dollhouses. Willing to risk minor shock and accepting the frustration of learning electricity is a testament to your commitment. We can't make it easy, but we should be able to guide you along the way.
You have two options for going about lighting your dollhouse: the copper tape or the twin wire method. We'll talk about both, but focus on the twin wire method.
Copper tape dollhouse wiring
As you might imagine, this method involves a thin strip of copper tape that adheres to surfaces and conducts electricity where you need it.
First, run parallel lines of tape in a discreet loop around the house. (If your dollhouse opens in the front, it is easy to completely disguise the wiring mechanism by looping it around on the back, concealed portion.) Next, attach the wires of your fixtures to the tape through holes you've drilled in the structure. Typically, the wires are soldered to the copper tape, but as long as the connection is sound, it will work. Finally, connect the copper tape to the transformer plug and plug it in. Simple enough, right? You might make a mistake here and there, but eventually this method will work for you.
Cheaper and a fair bit easier
Basically all you need for the twin wire, or socket strip, method is a socket board, a transformer, and your light fixtures.
Each fixture generally comes with about 60 centimeters of wire which can be strung however necessary. In this case, you'll simply string it through the wall, with as little wire showing as possible, and connect it to the socket board, wherever you have it positioned. The socket board has a couple dozen holes to accommodate plenty of fixtures, and it can easily be attached to the transformer to work in an ordinary outlet. Wiring a dollhouse is actually pretty easy, the majority of your problems will come from arranging your fixtures and positioning the wires and socket board(s).