I was pretty good at it in the 1990's and early 2000's. I knew quite a few who could explain the beliefs better than I could and a few who were about the same.
I imagine many of those same ones can still do it, but it probably drops off as the doctrine got into the ridiculous.
My mother knew some of the Fred Franz stuff pretty well. She could explain difficult Revelation stuff and 1914 stuff and the like. She was really good at understanding why the end didn't come in 1975, but was imminent.
But she gave up on figuring it out somewhere in the changes of doctrine. I think many will be just like my mother and get frustrated with the delay of Armageddon and not keep up.