Ultimately the short answer is that you have nothing major to worry about. Your training captain should be able to answer most of the questions you have, and if you're still worried after that, there are more than a few on here who can answer too (I know for a fact that there are several Airbus FBW line pilots and at least one TRE).
Change from what one is used to is always something of a hump to get over, but I'm certain that before you know it you won't even be thinking about it.