Another good method is using the color channels, most likely the green channel as it is usually the smoothest (least grainy) to create a alpha (mask) channel out of.
Duplicating the green channel as an alpha channel and using levels, you can get something like this (rapid test):

From there you can paint in the full whites with brush or feathered lasso tool + fill, after which you can use the burn tool set to shadows at about 5% strength to fill in the blacks and the dodge tool set to highlights at about 5% strength to fill in the whites:

With the following result:

It’s a quick test so the background is not all clean but you get the basic idea. And you probably don’t actually want that much hair flying off.