Mmmmm, i think with the first one you spend the time thinking. You have to think so hard. You have to learn a load of stuff about babies, and even more stuff about yourself, your recent experience, your guilt, your fear, your love, your man, your family, your home. You have to come to terms with balancing everything out in the end, while putting the baby first and trying to find who you are now.
That, and weeping at the dust bunnies under the sideboard which you can't get to because the baby (here you might never swear out loud but you resent the baby taking ALL your time so much you are doing it inside) JUST won't get off the breast/settle/stop squirming/stop crying/stop feeding and WON@T LET YOU PLAN.
By the time numbers 2+ come along, you've answered so many of the big questions, and have sucha clearer picture of what your family is shaping into. So then it's a question of logistics, stamina and luck...
What do you other 2+ mums think? WHy is it do-able? WHen I had only one, I wouldn't have believed it, i was frightened of coping at all!