It is has hard or easy as you make it really. It will be a big adjusment for your DD so patience is the key.
I was also of the theory that I needed to get DS into a routine so life was put on hold a little for 6 months which was tough but we reaped the rewards afterwards as my DS had a regular routine which made it easier to spend time with my DD and plan outings. I have friends who followed the 'baby should fit in with our life' theory and things seem so chaotic still for them, I just can't do chaos. I NEED ORGANISATION! :o
I have no family around at all (my family in australia and inlaws two hours away are uselss) and seem the least stressed of all my friends who get copious amounts of help. I put that down to the first six months of hard work getting DS into a routine (and yes DD was a little negelected at that time and cbeebies got a good workout) but it payed off for me.