You play with a gamepad, right? That's the only excuse I can think of.Play with wh_pl_showfirecursor 1 set. Archery is just impossible and frustrating without it.
With a mouse, archery is still challenging (as it should be) but certainly not in any way impossible. I got the hang of it quite quickly after a couple of hours of training and leveling Henry. Absolutely no need for a cursor.