I commented on sitting in your thread on holdover etc.
The above advice about closing eyes and seeing where the cross hairs settle naturally with your stance is excellent.
As in all target sports ... getting the rifle to fit you is another major thing. So that means getting the length of pull right for you. Also setting the height of the buttpad for you and also the depth of the fore end.
You want to be in a natural position and the gun fitting you. If you are trying to struggle to fit the gun then you won't be as steady as you could be.
I wouldn't get too worried about butt hooks. Butt pads and hooks are really to make sure you have the rifle in the same, consistent, position with respect to your body and head etc for every shot. They aren't really there to keep things steady.