I use the extremes of focal length for insects - a close-focussing 400mm and a 50mm macro but I employ a similar technique for approaching the subject with each lens.
Generally, I decide where I want to shoot from and get down to that level (it's usually about getting down low!) before making a final approach to the subject, checking lighting/shadows, backgrounds, etc., as I get closer so that there's a minimum amount of movement when I get into the final position.
Also, check all your camera settings are as you want them rather than have your fingers fiddling about just inches from the subject!
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