I was a theorbist for years. It's a lot of fun to play, but my case was steel and shaped like an enormous coffin. People on buses used to ask me what was in there.
"My mother," I said. "I take her everywhere with me."
Tuning was a nightmare. I played a lot with baroque orchestras and chamber groups, as well as performing occasionally as a soloist. The hardest thing was probably learning to play figured bass continuo. That's where you get a bass line and have to improvise four-part harmony on the spot in the appropriate style. OK with, say, Montiverdi, but no fun at all with Bach.
When I moved to Japan, I sold my much-loved and much-played theorbo. Now I've learned to build instruments, I'll probably make another one of these days.