GIMP Version: 2.8.10
Operating System: Windows
GIMP Experience: Intermediate Level

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Looking for solution to difficult situation, wherein hair is intermixed in complex background (trees in this case), and where there's not much contrast to work with. I've looked several tutorials/videos that address the 'hair' challenge, but so far I haven't found one that works in my situation. I know how to create layer masks using Desaturation, manipulating of Levels and Curves, followed by using Threshold function to obtain a starting point for such. However my various attempts have so far failed to produce a mask with proper edges that I can cleanly manipulate. I've tried using other multi-step techniques borrowed, some from Photoshop that use a Linear Burn as last step, but those don't seem to work well in Gimp I suppose. So I'm kind of at wits' end, and conclude that either there isn't a good solution for my situation, or more likely I don't really know what I'm doing, or there is a workable solution that entails a series complex processing steps that I'm unable to come up with.

I have the G'MIC plugin, and have played with some options, but I think I'm mostly just stumbling around. I'm attaching a partial of the hair-tree section of the image that is vexing me. The other half of hair intersection has a simple background, which doesn't pose a problem.

Thanks Wallace. I have seen that one, but I'll review it again.
I'll try just a simple inversion, don't think I've tried creating mask from that point.

Thank you!