Hi, my DS is 22 months, and DD 3 months... It's fab! I absolutely love being off with the two and it is much easier than I thought it would be 
My DS was a real cranky newborn, and was a really bad sleeper. I felt like a zombie for months and months after he was born, but just got on with it coz I thought all babies were like that!
DD on the other hand is the polar opposite of DS, and sleeps really well, and is generally happy and content all the time, which makes it so much easier to care for them both.
DS LOVES his sister and is full of kisses and cuddles for her, and this is really lovely to see the bond growing between them.
I do however have to watch him like a hawk coz he doesn't know his own weight when he's pressing kisses on her head! He has also tried to pull her out of her bouncer, get her undressed, yanked her hair and a whole aray of other things to annoy her...
Most of the time it is fine managing them both, no harder than one on their own. It does decend into chaos at least once a day..
How you cope very much depends on how you cope with stress, your perspective, and what your babies are like. When it's hard I always think to myself 'well some people have four children and cope, so it can't be that hard!'