I'm not sure what "trouble holding the scope on the target" means. If you are having trouble seeing the target through the scope, the gun may indeed not fit you yet, or the scope might need to be adjusted for you focal length,(slid back or forward so that when you put the gun up, you can see the target immediately). I would caution you that if you do cut the stock down now to fit your frame, save the piece of stock. In 2 years, you'll grow enough to wish you had that length back again.
If you are indeed able to see the target, but have trouble with a steady hold, use a rest. I won't shoot at a deer without a rest.
Using lighter bullets will cut your recoil down noticably.
A guy who shoots garands in the Camp Perry rifle matches taught me to shoot more accuraterly by pulling the trigger straight back with the pad on the tip of my finger. Pulling with your first knuckle introduces torque to the gun. So I would say that shooting with your finger tip will help your accuracy.