Unless conditions are good and you have time to set up a tripod, I find that handholding for insects is better, it's often about reaction time if you want some action shots. The only time a tripod is useful, is when the subject is at rest (usually roosting early morning, late evening). My advice would be to keep the shutterspeed high enough, easier with the shorter focal lengths, as insects are rarely still during the day. I also tend to pull back slightly from full 1:1 macro, so that I have room for me swaying and enable me to focus more easily and try to brace against a solid object if possible. You may also find a beanbag to be of use in some situations, they are much quicker to set up than a tripod and enable you to get down lower if needed.