Question Aligning New Cua Hair Perfectly on Head

[pengpeng17]

Hello guys i know this is probably very simple to do im just struggling recently i purchased a custom model and a little while later i purchased a custom CuA hair for the model. so i had to attach them myself. i know how to bring up the green dot nodes and align to them but this never works. i also do not know how to make the model stand perefectly straight and looking straight foward like the head looking straight foward at 0.0000 etc. i know this is a stupid question but im really cannot attach the hair correctly is there a guide on this or can anyone give me tips? no matter what direction i move the hair to adjust it a little bit of the scalp goes through on the other side.