Just find the posture, stance and anchor thats comfortable for you and dont change it. Keep shooting the same way and after a while it becomes habit and you will start doing it without even thinking about it.
I have a semi-open stance keeping my body approx at a 45deg. angle from the target. I dont use a peep so I have a kisser button which i place in the corner of my mouth then I rest my nose on the string so that the string is in the center of my nose that all keeps my shots the same every time.
Good luck.