I have three girls - the latter two are 19 months apart. My first two are 29 months apart.
I think support from DH and family is important when you have more than 1 child. I know if i didnt have my DH around some days i would have gone mad !
Its a bit of a juggling act, but when you hear them both giggling in a corner together in years to come, or when one comes to the other ones rescue when they've been hurt then yeah, its worth it. Its worth every moment...

Good luck.