For a steadier shot avoid sugary drinks and most of all caffiene! Nothing worse for shooters than to have a cup of coffee before any type of shooting! It will give you the wobbles and also interfere with your head. Have water to drink, or any squash. As has already been stated, never try to hold the gun bang on, this will cause muscle fatigue and strain, causing wobbles and in the longer term pain in the muscles you are stressing, creating, you guessed it, more wobbles!
Go with the flow! Breath easy, if you are preparing to take a shot take 5 or 10 slow deep breaths, push your chest out, m