Here's my tips:

Lean against something solid, such as a tree or a fencepost.

Sit down, bend your knees and rest your elbows on your knees. Use one hand to hold the grip of the camera and the other hand under the lens. I have shot 200mm at 1/6 secod without IS using this method AND got sharp shots.

If you have no external supprt and have to shoot standing up, make the top half of your body as compact as possible and the lower half as your support. Tuck your chin in, hold your elbows close to your sides and spread your legs slightly, one foot forward, to balance yourself. Hold your breath as you squeeze the shutter.

Gayle

--
'We don't make a photograph with just a camera. We bring to the act of photography all the books we have read, the movies we have seen, the music we have heard and the people we have loved.' Ansel Adams
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