After nearly six months off, the early mornings will be hard for the first few weeks, i'm sure. DD (14) is pretty good and gets herself up and ready fine, DS (13) on the other hand needs a gentle kick up the @rse most mornings.
Both of mine went from a very small, village Primary to a huge Secondary and i was concerned for both of them because they too are rather quiet kids, but by Christmas, they both had a lovely set of new friends and are doing really well.
DD is just about to start her GCSE subjects and can't wait to get back, DS is not so keen, but he'll be fine once he gets back into a routine.