I felt I was 100% certain it was the 'Truth' for a very long time. Of course the brainwashing started when I was only 5, so I was likely to see it that way. Many things seemed right to me for a long time. Part of that too was the isolationism not allowing me to see the real world outside the watchtower fishbowl, or the real world inside either.
I started to question a few things in the early 80's when a bunch of self righteous asses elders made sure I was not re-appointed to the servant body when I moved to another area, in spite of begging me to stay in thier congregation due to needing my services as one. But I got over it - returned to the flock after a few years of 'inactive' status, and once again was 'serving' the brothers. But the cracks had appeared, and I too began to see that elders were clearly not appointed by Holy Spirit.
The 90's brought the start of real doubts - but like many I focused on the local congregation and just knew it was not the organization in total that was so screwed up. Then another wheel fell off the wagon for me when the change in the '1914 Generation' did not even seem to bother the brothers and sisters. I began to recognise what zombies we really had become. Still I believed.
2003 late fall. Searching the internet for God knows what - wifey and I began to 'crave' information from another source than Brooklyn. We avoided most 'apostate' sites, including this one during that spell, but read a few essays that eventually lead to CoC and ISoCF. I was still hesitant and kept going back and looking at Ray's website and tossing it about - finally Wifey informed me that the books were on the way - like it or not - she was going to read them and I could do what I wanted to. I read them - again and again. By January 2004 we were 100% convinced it was what it was - lies and manipulation. We never went back.
I spent 43 years of my believing - took me about three weeks, more or less, to know it was all wrong. We celebrate three years out when the ball falls in Times Square 2007.
Jeff