For our oldest, she did it all herself. We talked about costs--if she went with her first choice, she was getting loans--but she had valid reasons for going with her first choice, and it was the right decision for her.
Second kid--no issue. He's at the local community college. In time, he'll transfer to Local U., and live at home. He has many issues, and can't manage on his own at this time (here's hoping for the future, but it's a long slop).
Third kid is a sophomore in HS. Based on her personality, I think she'll do better if she can come home on the odd weekend. We're strongly encouraging her to take a good look at the state flagship university--it's a quality school and one of the biggest bargains for an education. In her case, she wants to go on to law school, so we pointed out that saving money on her undergraduate degree will let us help her pay for that.
Fourth kid will likely go the engineering route (chem. eng. looks possible). We'll deal with him down the line--he's in 7th grade now. We don't know our Southern engineering schools.