hmm i needed a month, to find out the best workflow for me.

My workflow for the attaching:
In the first month i painted the glue at the whole area where i want to atach the hair. But i often had the Problem, that i did a mistake and than the whole piece was skew on my head. the glue holds intsandly and than there is no time to fix some failures. After some try and errors i find a better way: i paint only glue on my back head, than i roll the hair from the forehead to the back. Because there is only glue on the back i can atach everything slowly until everything fits perfect.

i dont know if there is another better way to attach but for me its a good method to prevent obliqueness