I don't obsess over my brows (as you might have noticed from my lotds), but when I do, I do it too much, which often leads to over-tweezing & trimming. Then I would have wait till they grow out evenly to reshape them again. I have stopped going for threading, mainly because all that stretching freaks me out now. I have kinda droopy lids, and stretching them too much too often, will eventually lead to sagging. I don't want to need a brow lift any time.
This tutorial will show you how I pluck & groom them.
In the following diagram, is the basic guide to shape eyebrows
I use this guide coz it isn't complicated, like some guides with lines everywhere, and it works for me.