Well i guess first make sure you bow is set up properly, "Tuned"

2nd: Make sure your shooting the correct arrows for your set-up. length, spine, ect..Go to your proshop for help on these things if your not sure.

3nd: Like others have sead. Practice, Practice ,practice, If you are hunting from a tree? Practice from a treeand when you think you have practiced enough? (Go practice somemore).

good luck.