For us, it was very easy because we had decided to do two at once as DH said there was no way in you-know-what he was going through this process ever again after we were about waist-high deep in the paperwork, heh, heh. Therefore we thought if we're gonna do two at once, why not request a little boy and a little girl so as to enjoy the experience of raising both a daughter and a son, plus we wanted them to experience having a sibling. We had requested an infant and a toddler, didn't care who was who as to age, but ended up with two infants just one month apart -- so you really just never know what the future has in store for you!
It's been awesome -- Alexandra and Christopher have become the light of our lives. We are so blessed with our two cutie patooties, and strongly recommend doing two at a time if you are able and up for a challenge!