Photoshop :: Filter Extract On Hair

I am using the Filter Extract method to clear cut or background erase around some pics of ladies hair. I understand this is the best tool for this task.

I have studued the Photoshop Help and a couple of tutorials on this subject, and have achieved a couple of passable clear cuts. But as awlasy there si room for improvement.

I am trying to assemble some notes on the best settings etc to use and thought someone out there might be able to contribute.

I have found it a good concept to do the models hair with the Filter Extract option and then to use the Magic Lasso for the rest of her body. Do you agree ?

When in the Filter Extract mode is it best to zoom in on the models face to work on her hair ? Or do you work at actual size ?

Most tutorials say to use a wide brush over the hair edges. Is the idea to move the brush exactly along the hair edges or do you move it along across the edge of the hair and the background ? Is it best to set the width of the brush so that it can cover the width of all of the wispy bits of hair in one pass, or can you just go over them with the filter extract brush?