Im glad to hear it. I used to be that guy that if i didn't find anything i would get upset with myself and give up. Not anymore though! When I first started hunting I think I missed 3 deer before I got the hang of controling myself and making a good shot. After he gets the hang of that he will be laying em down one right after the other. He just needs some more seat time! I hate to say it but i missed 3 deer last year. One my scope mount was loose. The other two I had some screws loose upstairs i think??? I just plain missed.
I know it sounds silly but when i practice shooting (bow, rifle, pistol) I run or do pushups or do something else to get my heart rate way up. Then its just like buck fever without the buck. It might give him some confidence in the stand if he knows how to control his breathing and make the shot count.