45 grains would not generally be too heavy a charge for hunting, but it is about double of what you should be starting out with. Once you can get a fair group and can do so consistently, then start inching the load up to hunting power, if that is your desire. By the time you can hit a consistent group with a moderate charge, your hand and reflexes will be accustomed to aiming and squeezing the gun. The front heavy nature of the design causes hand fatigue during range sessions at first, so practice, practice practice.
Pay attention to your stance and breath control. Feet about shoulder width apart, toes slightly wider than the heels. Drawing a line across the tips of the toes should go straight to the target. Stand erect, shooting arm extended and the free hand on that side's hip or even tucked in the hip pocket. It tends to pull that shoulder back to keep posture more erect. Drawing a line through both shoulders and down the shooting arm should go straight to a point directly above the target.
For hunting, you will probably want a two hand hold police combat style. That takes a different posture and hold, but breath control and squeeze are still the same.
Either way, You want the hold, breath control and squeeze to be such a habit that you don't need to think about it, that it becomes an automatic unconscious habit.