I read AndyW's post as New York, too - but read it again, 'now York'.
Injuries, hate em. I missed this year's Paris due to injury. Just build up slowly, time wise and distance wise. Get your body used to running. Don't change running shoes from something that has never caused a problem - like I did.
Hi MoominRun - welcome to the thread. You've picked a great marathon for your first - Paris was my first too.
As Meadower said, don't worry about the miles that other people are currently doing. This is an all year round thread, so people do lots of events and we are now in Autumn marathon season.
Don't compare yourself to others, compare yourself to the person you were before you set yourself this challenge. Take it slowly, get yourself a plan, if you can - have a look at Hal Higdon's plans (he's got three for novices and you can tweak them to fit in with your life)
Above all, try to enjoy it - don't put too much pressure on yourself - and feel free to ask any questions you want. We love questions, even about running.
Also, post your bib number and start pen (I'm guessing pink(rose)) and our marvellous list fairy will add you in.
Your starter for ten, have a look at the first two posts on this thread. They'll give you lots of useful info as they were put together by people who have run Paris before.