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Try searches like {photoshop extraction cutout hair tutorial sitehotoshopgurus.com}.  Take out the "site" part if you want to cast a larger net.

Here's one thread where our ibClare discusses her favorite technique:

https://www.photoshopgurus.com/forum/general-photoshop-board/37659-trick-extract-image-background.html

Also, spend a few minutes looking at commercial cut-out tools such as Mask Pro from onOne Software, Remask from Topaz Software, and Vertus' Fluid Mask. 

Even if you don't use these particular products, many of the hints and  suggestions they give in their tutorials are generally applicable and excellent, e.g., (1) as you develop your  cut-out / mask, constantly check it against black, white, and highly  colored backgrounds; (2) generate your mask using a contrast-enhanced,  extra saturated version of the original, then throw that layer out and  apply the mask to the actual layer(s) of interest; etc..

HTH,

Tom