Baby #2

ASmith
My husband and I were blessed this month to have a bfp for what will be (technically) baby #3. 
Our first son was killed in a car crash, and our second son is home with us. 
We constantly comment on how we feel our second son is missing out on a sibling, and how much we want another baby in the home for him to grow up with. 
But now that we're expecting, I'm so nervous to have another child because we don't have any family in town / friends to help. My husband works crazy hours (65hrs a week). 
How do you make it through the first year of sleepless nights - taking care of an infant- and a toddler?