Some Metro stations require you to insert your ticket again to exit - so hold on to it. On Sunday, when I went to wave BB off at Gare de Lyon (sniffle), I threw my ticket away before the exit barrier and then had to rummage around in the bin like a plankton to retrieve it - which was rather embarrassing.
Don't walk around staring up at buildings admiring the architecture. It's true what they say about Paris and dog merde! Keep your eyes on the ground.
When viewing apartments for the first time, if the landlord says, "it's very quiet here", he is lying. I have a sideways neighbour who plays the piano (well) which is acceptable, but an upstairs neighbour who clops around in hobnailed boots on bare wooden floors which isn't. But I've found a solution - leave the extractor fan on in the bathroom to create white noise (which I'm used to at home with the sound of the river) and drown out everything else. Sorted.
I have my first lesson tomorrow morning. My school bag is packed (with a tarte tatin for the teacher!), my uniform ironed - and I'm just a little bit nervous.