i would have to say the most important thing is to always have to same posture....
i learned this the hard way after shooting for 1 year.
steps:
1. try numerous positions/posture and find the position that you like the most.
2. practice getting in that posture, as soon as you draw your weapon you should be getting in that posture, now you dont nessacerily have to shoot every time you draw but make sure that you can get in the same posture time after time, once it is commited muscle memory you move to the next step.
3.start shooting at a target and always aim for the same spot. it doesnt matter if you miss all the time just shoot until you see all of you arrows/spears go in the same general direction. (this only applies if they are the same)
4. start learning how to compensate for the tendency. if it shoots low and to the right shoot high and to the left. it helps to have a constant point to focus on (on the projectile or weapon).
5. once you are shooting nice tight groups around the bulleye move forward or back a couple of yards and learn how to compansate for distance (this takes time)
6. learn each individual spear/arrow. this means you need to shoot 1 arrow/spear many many times with the aimer aimed at the bulleye and watch and see where it lands. usually all of the arrows will be a little different. but individuall arrows/spear will probably be off by 1-2 inches from the exact center when shooting at normal distance. HINT; i number all of my arrows and i know that number x goes up and to the right and the number y goes to the left and down by 1 cm at 15 meters ect.
7. practice and learn to compansate for each individual arrow/spear. be carful though i have broken many nocks from 15 meters from my arrows hitting each other.
8-100000000000 PRACTICE PRACTICE PRACTICE
well if anyone has any better way please tell me
thanks