As someone coming from a 'guess culture' and having a manager from an 'ask culture,' one major problem I am having is not being able to say 'no' to my manager. My manager always emphasizes the importance of asking things around rather than expecting people to just know how to help you. I know he also just asks me with the expectation that I could say no, but I always feel like letting him down if I say no. Therefore, I tend to overcommit to things and work overtime. This looks good on performance (I always got good feedback), but I'll probably burn out at some point if I cannot get this communication right.