Nikon D600 ISO1600 macro shots.
I wouldn't say my hand holding technique is anything special.
I just try to stabilize the camera as best as I can - if possible lean against a solid surface, etc.
Most of the times I just brace my hands/arms against the body, breath in & out as gently as I can & take photos.
Sometimes you get quite a few keepers, sometimes you don't - remember I'm only posting the best ones