I found it difficult to get the assigned "householder" to practice. They nearly always wanted to meet right before the meeting and go over it in the library. Of course, this brought dirty looks from the school overseer for not preparing ahead of time.
Then there was the alcoholic sister that, even with my note cards in front of her, asked the wrong opening question. I said, 'That's an interesting question, we can cover that in next week's study.' And gave the talk filling in her parts.
One time, a know-it-all elderette refused to give me notes. She basically said, I should do the research and wing it. Another time I sat in on a study with her and a Catholic nun. She, the JW sister, didn't even crack the Bible open in over an hour.
Interestingly, this elderette's husband went rogue and had to be pulled off the stage. He was DF'd for apostasy and took about half of their prominent extended JW family with him. He kept on repeating, "Always remember your Mother." I never figured out what he meant. He later sent me a book he had written about his issues with JW doctrine. I circular filled it.
Fun times!