If this doesn't work well, you can use the BS, or an other picture, hair.
Yes, I try to use that as much as possible (sometimes I have trouble though).
But for this one, for example, there was her something (mic/hand) in front of hairs that prevented me from using her whole hair.
So I had to cut before the hand, and try to make a natural cut. I mean I can't even take the full width otherwise I'd just end up with the hand at the end.
I really have trouble dealing with such things. I also tried download hair brushes, but I'm just too bad at using them.
But yeah, generally speaking, even when I've not those kind of problem and full hair available, I have problem make it looks natural.