Yes, one of my pair is the Hobbit Gandalf - the one with a scarf.
The new head has a socket that fits over Gandalf's typical ball joint neck. Take the old head off, put on the new one. Try not to yank the entire ball peg out of the body (that happens sometimes
) Use a hair dryer to warm the head socket if the fit is tight. U can use a bit of water on the new hair to style and fluff with a bamboo skewer/forceps/small screwdriver/nail/your fingers if u like. Or not. Don't be afraid of getting the cloak/costume wet I've sprayed it with water multiple times for shaping it - no dye bleed or anything, Go ASMUS for the quality!
I like my Gandalfs fluffy feral with waves and curls, whatever the films were doing.
Congrats it's a great head, don't know what kind of wool this is but it's nice and silky. Great hat too, still surprised I like a vinyl hat this much, and it doesn't mess the hair either.