In reply to WJV0912:
> I'm struggling to find any quality route descriptions for BDE.
I don't want to misinterpret you, but if by "quality" you mean "having as much detail as UK rock routes", then alpine route descriptions are very different. This is where route-finding skills and mountain sense come in. Having said that, on routes like the BdE Voie Normale it's very difficult to get off-route, partly because of the people and the trench they make in the snow, and also because of the line and the amount of tat (though that can be (very!) misleading!).
An analogy for the difference might be to think of how a competent rock climber reads a scrambling guidebook's route description: although it'll have a lot of detail, your experience will mean that all you need to know is where the route starts, and perhaps its general line. A walker on the other hand will find the detail very useful.
> Also I am struggling to decide on clothing as I've never been to the Alps before. I'm not sure whether to just don my Paramo smock the entire time and adjust my layers underneath...
It's almost a certainty that you'll fnd your Paramo too hot, though I have friends who swear by it in the Alps (as I do in the UK, except on hot summer days). The key thing is flexibility, bearing in mind that you'll be on the move almost the whole time. (Think of running in winter and then walking in blazing summer sun.) Base and 1 mid layer plus windshirt plus a warm layer and shell do me.