the more you shoot the stronger you will get, the best thing to do is pull what feels comfortable in any situation. siting down standing up on your knees etc
Sit flat on the floor with your legs crossed "indian style" and hold the bow straight out in front of you and draw it with out raising it to get leaverage.
Two good peices of advise , if you can draw and shoot comfortably sitting down , you probably are not overbowed . It allso helps in a treestand situation , when a deer sneeks in on you . Some archers are abill to shoot well without standing , from the seated position , reducing the risk of a deer seeing you stand up and spooking it .