Grouping prone, from a front and rear sandbag until 10 round groups are 1.5’ish MOA. Once on consistent precision from a rest is achieved, then prone over a backpack until 10 round groups are 1.5 MOA and no larger than 2 MOA on demand. Same for a bipod if using one.
Once someone can lay down at any point and hit a 2 MOA target with every round fired over a pack, then positional work needs to happen. Sitting and kneeling using alternate rests, primarily a pack if you use one, but with hiking sticks, tripod, downed trees, etc. 2 MOA targets should be consistent from these positions. Then standing using both rests and offhand.