Editing Workflow

I was wondering if everyone has their own editing workflow or just goes with the flow. For example, like you can either stack up on presets, overlays, greenscreens, sound effects - OR - download what you need as you go. Currently I'm editing a video that needs a greenscreen explosion effect and either i go on yt and download a quick one, or I go search for a little while and find & buy an explosion mega bundle so that I'm good for the future. Idk if this makes sense but I'd love to know.