You can use the camera strap as a brace, it may be tricky to describe without diagrams but I'll have a try...
Hold the camera in your left hand, lens vertical, so the strap hangs down.
Put your right arm through the strap, rest your upper arm on the strap.
Raise your forearm and move it slightly to the right, now bring it back over the strap and take hold of the camera in your right hand. The strap should now cross your hand below your index finger then run across the back of your hand.
Experiment with the strap length so that it's nice and tight in this position.
Whilst holding the camera firmly against your face you can now tension the strap by moving your elbow - I find this helps reduce a lot of wobbling.
Hope this helps (and makes sense...
)