I live in a 20-story building built in 1929 and I want to do some minor renovations on my apartment. I've worked on a basic modern house made of 2x4s and drywall, but I'm out of my league here. I don't even know how to hang a mirror up on the wall...

If it's made of gypsum brick, can I treat it like masonry? What if it's hollow? Can lathe-and-plaster support any significant weight? Is drilling into the wall going to release some ancient evil they used as a normal construction material back then?

I'd love to find a guide for how to do even the basic things in these buildings. Does anyone have recommendations?