As theFixer keeps saying, it's not hard.  I fit any hair to any character.  If it's a hair prop just turn the dials until it fits and then lock it so it doesn't move after you pose the character.  If it's a conforming figure do this.  Keep your Aiko (or whoever) in the default position.  Load the conforming hair (don't conform it) and then turn the dials until it fits. Then go to figures "set figure parent" and select head from the list.  With the character selected, pick the hair body (this is important), go up to object and lock it so it's doesn't move when posed.  These directions are for Poser4 so just do the above for any version of Poser you're using.  P.S - after posing you'll have to unlock to be able to move the morphes around and then remember to lock it again.

My idea of rebooting is kicking somebody in the butt twice!