I fell pregnant with #2 when my eldest was 9months. I was scared - thinking about my DD and that she would feel really left out, and that it was going to be so hard.
But I can honestly say to you, that I don't remember that time, when DD2 was born, being at all difficult. i am sure that there were times that I wanted to yell and scream, but I don't remember them.
My girls are such great friends, I am soooo glad that my DH pushed for the small age gap.
I hope you're able to make the decision that best suits you and your family.