yes i have experience...a 5 yr old & a 7 yr old...life changes more dramatically then you can ever imagine, in every conceivable facet. and forget about sleep for a few years. make sure you are really ready and your marriage is strong, for the dynamics will change forever.
i was 31 and married 8 years when i had my first, and at 38 i am ready for the looney bin!
(i know this was not the advise you were looking for, but...)