Not sure if you are an NS man. If so, try and recall your shooting lessons. The principles of good shooting applies.
- Correct holding - i think a few of the bros have already mention earlier
- Correct breathing technique - breath normally/gently; not heavily/panting
- Correct way of squeezing the trigger - already mentioned, don't stab the shutter button jerkily. Press gently and slowly all the way through. Before taking the shot, take a breath, exhale a bit and hold your breath while pressing the shutter