I know you've already ordered (and now received?) them but I thought I'd put my pennies worth in.
I ordered a set of Schwalbe Marathon Plus with the idea of putting these acclaimed 'ultimate touring tyre' on for my tour. I couldn't for the life of me get them on my rims, nor could my LBS (and I've heard other accounts of problems on the net) - and they were definitely the right size for my rims. After a few hours of it I came to the conclusion that this was not the sort of hassle I wanted at the side of a road with a puncture so gave up and went back to my original Conti Top Touring. (I've still got the Schwalbes by the way, never used, 700x32, open to offers)
I understand that once on and ridden for a while they would probably be easier to take off/put back on, but it wasn't something I was willing to risk.
I ended up on Contis for most of the tour, with a few emergency no-name ones bought when things got desperate.
Not saying Schwalbes are always a problem, but I would advise you pay attention when fitting them first time and if you have real problems consider if you fancy doing the same on a cold, wet German radweg (something I did too many times!)
Would also say keep pressures up when you're away - all tyres have a nasty habit of the walls wearing away (and possibly then exploding) if a decent pressure isn't maintained, especially when you're carrying extra weight (I mean the baggage

)