自寻烦恼

tự tìm phiền phức

worry oneself needlessly; bring vexation on oneself; torture oneself with unpleasant thoughts 即使真出了差错也不会让你负责，何必为此事 自寻烦恼 ？ You are not to blame for any mistakes if there should be any; why should you trouble your head over such matters?