A few stepping stones:
1. As a teenager I was told (1980's?) that Babylon the Great had fallen. I looked out of the window and saw it actually hadn't.
2. Knowing that babies naturally eat white blood cells in breast milk, but could not take a white cell transfusion because the WT says to abstain.
3. De Cruce Libris Tres (Justus Lipsius) held up as a definitive support that Jesus died on a stake. Found it online and realised this was the opposite of what that book said. Went on to realise that '...' in any WT quotation actually means "we've misrepresented the quote right here".
4. Adding square brackets '[ ]' in the Bible to denote where something has been added that does not appear in the text, then seeing the latest version of the Bible keep the spurious additions but remove the square brackets, so you are deceived.
These days the WTF moments come thick and fast. The more you know the more you can see.
Splash