Here's what happened to me when learning TTATT. Just preparing you for what may come for you:
1. Cognitive dissonance - learning that things that you believed deeply are not all true.
2. Could it really be? - The verification process. Claims made by others you must verify for yourself. This means LOTS of research. But, in my experience, when you never had time for it before, you actually make time for it now. It becomes almost a compulsion, an obsession. You have to re-prove "the truth" to yourself, and when you find out you can't, then...
3. Anger, dismay
4. Wanting to tell your closest associates (but can't because you'd be outed)
5. Dreams (oh, the dreams... they get really strange)
6. Then you think... oh, wait... I'm leaving out the most important thing... prayer! So you pray. Hard. Like never before.
7. You're mentally left in a kind of in-between state (between being a JW and not being one). At meetings, you quickly pick up on the wrong teachings. You quickly see misapplication of scriptures. You quickly recognize everything wrong. And it becomes really hard to hide your reaction.
8. At some point, acceptance. You accept that JWs are wrong. You accept JWs do not have "the truth". You keep up appearances for friends and family sake, but you know deeply that this cannot continue for the rest of your life, so you start planning your fade.
I'm at #8. Fading is the hardest thing to do when all your family is IN.
People leave for different reasons. Some because of how they were treated by elders. Some over the blood issue. Some over policies on child abuse. For me it was over teachings and Pharisaic attitudes encouraged organizationally.
All the best to you. Welcome to the board!