That is a great question, one I've been asking myself lately. The conclusion I've came to is that I will never be able to' let' go of all that I was taught. It was ingrained in me since I was a young child.
Some of it was bad and lies (UN, college, holidays, etc). Some of it was good(learning to speak publicly, study habits, cleanliness). I now realize that I can let go of the fact that it is not the truth. When I first discovered they were lying, I was devastated. I became obsessed with everytihing JW related. I was so pissed at the WTBS and all they stood for.
While I can't 'let go" of all of my upbringing and past, I feel as if I am 'over it'. "It" being the whole JW thing. I feel so much peace within myself.