1 - Wear the appropriate safety equipment (eg goggles, ear defenders, harness) even if strimming for a short time

2 - Always take the petrol can with you....you WILL run out of fuel with approximately 0.5m x 0.5m left to cut

3 - Never strim so quickly/enthusiastically that you breathe at all heavily, otherwise you will end up breathing through your mouth at precisely the same time that you strim an unsuspecting frog or slug