Yes, there is the potential to 'think' you know it all, and will likely miss out on important facts and figures.
So with that in mind, do go in with an open mind, study what you have to, listen to the instructors, ask the relevant questions, and actually learn what is presented.
Undoubtedly, some of your previous knowledge will be helpful, but do not rely on it, or use it as a crutch. As you have pointed out, real world flying is different.
However, you have earned points for enthusiasm - now back it up with some hard work and a 'positive' attitude.