I have found with all my kids that the first 24hrs are quite calm, and baby/ies are quiet (recovering from the delivery and are usually tired and not interested in feeding). You are exhausted, and it is difficult to sleep in hospital so you tend to nap when you can day and night for those first few days. During that time the babies are reasonably settled and pretty undemanding.
It is usually by day 2/3 that things kick off, and in my experience 24hrs before my milk has come in!!! I have always found myself on demand feeding every 30mins/hr from day 3 onwards, and usually my babies are ravenous and unsatisfied because my milk is only just beginning to come in my day 3/4. I personally find that transition period quite stressful, because you are tired from lack of sleep, getting desperate for home and have a suddenly 'wide awake' full on baby asking to be fed!
Just as you think you might tip over the edge, you are allowed home, the milk starts flowing and babies are more satisfied. Although it is still tiring and demanding, you can steadily then begin the recovery process in the comfort of your own home, and start to get a routine going.
This of course is all based on a 4/5 night hospital stay (which you may not need), and on a reasonably rough delivery (both of which I had). I can't say that the twins were any harder for me than my singletons had been, but then they weren't my first and for me having gained experience with singletons, it made the twin experience easier. I was busier with two, but they were no more or less demanding than one had been (I had a very unsettled, whingy first baby tho
).
Having a newborn is hard work and an adjustment anyway (as you already know girls), and I don't think two newborns are that much harder except that there is less time and opportunity for sleep (but then I never had that anyway with my first).
So in a nutshell, the hard work starts immediately, tiredness and recovery from the delivery initially, then the demands of babies second. It is easier to manage the babies once at home, because help in hospital is scant, and you get to sleep in your own bed, eat your own food etc, but the babies themselves are no more or less difficult whether at home or in hospital once they have 'woken up' to the world by day 3.
Get a good routine from the outset if you can because this is key to surviving those early weeks. All in all there is nothing better than having babies (especially twins) so once you are through those first tiring weeks, the rewards will far outweigh initial difficulties
Jees I've rambled - sorry lol xxx