I think I subconsciously knew something was off for years. But I always avoided any "apostate" sites like the plague. The turning point for me was an article posted on Fark.com several years ago. It was article in a paper about an upcoming District Convention in Florida, and in the comments I happened across someone posting how the entire JW theology was based on the year of 607 BCE, and how not a single historian, scholar, or expert agrees that Jerusalem was destroyed then. That they were literally the only people in the world who thought 607 was the correct year, and how everything else falls apart after that. I had never heard that before, and it really jarred me. Then someone posted a picture of the pyramid grave and talked about the pyramid measurements Russell was fond of. That lead me to immediately find and start reading Studies in the Scriptures. That's when I started discovering that so much of what the modern Society claimed about the original Bible Students' teachings was demonstrably wrong. And not just wrong, but intentionally misleading.
And I couldn't stop reading after that.