T.,
I work from home as the office support for my husband's business so I am on the phone quite a bit. My kids are 4.5, 2, and 3 months. If I had it to do over again, I personally would have waited to put a greater age distance between them. IF you have a lot of support, from your husband, sister, friends, church, etc., than it's totally do-able without losing your mind. My primary problem is the very tough choice between constantly spending quality time with the kids (that's what I'd like to do!) or taking care of the business duties so that we all have a place to sleep, food to eat, etc. Right now my attention is split between business and kids and I'm not sure it's benefitting anyone!
My toughest parenting challenge so far with having the 3 month old and the 2 year old so close together has been potty training. Inevitably, every time the 2 year old had to use the potty, I was feeding or diapering the baby. Because of that, it took several months longer than it probably would have to get the 2 year old reliably potty trained.
Best of luck in your decision. Children are always a blessing regardless of timing, but remember that it is truly your choice. If you feel your support system will be there for you and you want to do it, I say go for it!
K.