Shooting before the hunt helps. Also, before taking that first shot, take time to prepare yourself. Stretch out your arms, shoulders, back, stomach, and get the blood flowing good and get good and loose. Then take the time to dry draw your bow 3-4 times. The first shot is the most important, so really concentrate on good form. Keep square to the target, shoulders in line, and keep the release hand close to your face (if you haven't, develop a second anchor point to go to after the release, thats in line with everything else. I touch my ear lobe.) Dont rush the shot. Invision it really is a deer, and get your concentration. Dont take your eye off that spot until the arrow has long stuck in the target. Start close, take one arrow. Hit or miss, go back to the house and come back in a half hour and do the same. First shot hits are NO different then the 20th shot. Form... form... form.... Missing that first shot is indication your form is breaking down somewhere. Start off keen, and ready. Practice it.