I think it is very difficult for a black women to raise a boy into a man. That doesn't mean that they can't. It is just very difficult. The same would go for a black man trying to raise a girl into a woman. It can be difficult. But it does happen. One of the biggest challenges, if not the biggest, is the number of single female headed households with children. This fact of life for black american families is a problem.
Now before the women jump on me, let me just say there is enough blame on all sides. Black men need to be more responsible. Black women need to stop having babies by men that won't take care of their children. A society that encourages both. When you look at some of the issues that we as a people face. The number of black men who don't graduate high school ( the latest number is about 60%) and the high percentage of babies born to unmarried black women. I believe that part of the problem could be traced back to the high number of single female headed households.
I don't have a solution to the problem, but it is one we need to be honest about. Stop pointing fingers and go about solving it. So to answer your question, yes it is difficult for a black women to teach a boy to be a man.